Answer:
what grade is this?
Explanation:
For many years, scientists thought that the universe was static—that it had always existed and been the same, and it was neither expanding nor contracting. Then, in the late 1920s, Edwin Hubble recognized that the shift in light from distant objects toward the red end of the spectrum meant that those objects were moving away from Earth. The best explanation for these observations was that the universe was not static but was expanding. More recent observations, such as cosmic background radiation, are also better explained by an expanding universe rather than a static universe. What aspect of scientific methodology best explains the replacement of the static universe theory with the expanding universe theory?
A Science and its methods are always improving. Scientists needed newer, more sensitive instruments to detect the slow expansion of the universe.
B Hubble’s observations were extremely popular with the public, leading to overwhelming support for the new theory.
C The new theory explained Hubble’s observations, and it was tested and supported by additional observations. The theory was accepted because it was the most powerful explanation available for many observations.
D The natural progression of science is that all theories are eventually replaced by new theories until one is established as law
Answer:
C
Explanation:
B has nothing to do with the scientific method. The public does not determine a scientific law. Facts do.
D may be sort of true, but it does not explain Hubble's process. Nor does it explain what Hubble actually did and how he reported it. D is incorrect.
A was never implied (although it is likely true. On the other hand, many great scientific principles are uncovered with very simple apparatus.) A might be 1/2 true.
I think the best answer is C. It is general enough to be accepted. There are two theories mentioned. So C is the best answer.
1. When did stromatolites appear on Earth?
Archean
Hadean
Mesozoic
Proterozoic
Answer:
Proterozoic
Explanation:
Stromatolites appear on Earth in the end of Proterozoic era because Proterozoic extended from 2500 million years to 542 million years. The stromatolites were present on earth about 542 million years ago. The stromatolites present in large number on the sea shores around the world and are considered as the Earth's first visible life form which can be seen through naked eye. These stromatolites were the first known organisms in which photosynthesis occurs and produce free oxygen..
Answer:
Archean
Explanation:
I took the test
The walls of the human heart are made of a specialized form of muscle tissue known as cardiac tissue. This cardiac, or heart, tissue contracts the chambers of the heart to cause rhythmical beating and blood circulation.
Tissues in the human body, such as cardiac tissue, are made up of
A.
nerves.
B.
blood.
C.
organs.
D.
cells.
please help meee
Answer:
d. cells
cardiac tissue are made up of cells.
if you have the gene for hemophilia, will you always have hemophilia?
Answer:
most likely
Explanation:
Question 4
Nearly 30 percent of the native flora in the United States is considered to be of conservation concern. Without human intervention, many of these plants
may be gone within our lifetime. For the native birds and mammals of the United States to survive, plant life must be conserved. What product of
photosynthesis do plants provide to all animals?
Your answer:
Oxygen
Carbon Dioxide
Light
Hydrogen
Clear answer
Question 5
Answer:
Oxygen
Explanation:
Pollination occurs when pollen lands on the -
A. style
B. anther
C. stigma
D. filament
E. ovary
Answer:
C. stigma
Explanation:
"stigma"
Fertilization in flowering plants happens through a process called pollination. Pollination occurs when pollen grains from the anther land on a stigma. After pollen grains land on the stigma, a pollen tube grows from the pollen grain, through the style, and into the ovary.
*EXTRA POINTS* what should be done with the two forces to find the net force? 29 N→⬛ 48N ← *
1.Consider the model above compare the DNA sequence of the model and abnormal CFTR gene explain the differences and similarities between the two.
2. Explain what caused the abnormal structure of CFTR protein.
3. Considering the structure of the mutant protein channel do you think it can perform the same function as a normal CFTR protein channel explain why or why not?
Answer:
1.Their similarities are that they both contain the codons for the following amino acids Isoleucine (ATC), glycine (GGT) and valine (GTT).
Their differences are:
a. Their codons for the second isoleucine molecule is different, ATC in the normalgene compared to ATTinnthe abnormal gene.
b. The codon for the amino acid phenylalanine is lacking in the abnormal gene.
2. The abnormal structure of the CFTR protein is because the amino acid phenylalanine is lacking in the polypeptide chain of the that region of the protein. This would result in an error in the secondary and tertiary structure of the protein.
3. The mutant protein would not be able to perform its function of channelling chloride ions across the membranes because the protein molecule is not properly folded for this function.
Explanation:
1. The DNA sequences of the normal CTFR gene and that of the abnormal CFTR gene shows some similarities as well as some differences.
Their similarities are that they both contain the codons for the following amino acids Isoleucine (ATC), glycine (GGT) and valine (GTT).
Their differences are:
a. Their codons for the second isoleucine molecule is different, ATC in the normalgene compared to ATTinnthe abnormal gene.
b. The codon for the amino acid phenylalanine is lacking in the abnormal gene.
2. The abnormal structure of the CFTR protein is because the amino acid phenylalanine is lacking in the polypeptide chain of the that region of the protein. This would result in an error in the secondary and tertiary structure of the protein.
3. The mutant protein would not be able to perform its function of channelling chloride ions across the membranes. This is because the protein molecule is not properly folded for this function. As illustrated by the model, while the normal protein can open for ions to move through, the mutant protein cannot.
Help plss I don’t get this so can someone plss help me!!
Name two positive effects caused by high biodiversity
means, a lot of life in a particular area
Explanation:
High biodiversity means that a region supports a wide variety of species, while low biodiversity implies that an area supports only a few.
A drought is a period of unusually low
rainfall. A farmer notices that a well on the farm stops providing water
during a drought. A nearby lake also
has less water in it than usual. Write a
couple of sentences that explains
what has happened to the water table
in the area to cause these results.
In the drought period, the water label usually lowers due to the extreme heat of the sun that forces the water to undergo the process of evaporation and absorb all the water present on the surface.
What is drought?Drought may be defined as a brief period of abnormally dry weather sufficiently prolonged for the lack of water to cause a serious hydrologic imbalance in the affected area.
During severe droughts, people depend heavily on groundwater—the water held underground in aquifers. During these periods, the rainfall is less than normal for several weeks, months, or years, the flow of streams and rivers declines, water levels in lakes and reservoirs fall, and the depth of water in wells gradually increases.
Therefore, in the drought period, the water label usually lowers due to the extreme heat of the sun that forces the water to undergo the process of evaporation and absorb all the water present on the surface.
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the primary structure of a protein refers to the sequence of amino acids that are linked together in a long chain which oft he following common items would best represent the primary structure of a protein?
Answer:
In a primary structure of protein the smaller subunits amino acids are linked by peptide bonds. The peptide bond is formed when carboxyl or C=O. The long string of bead represents differentamino acids formed in the ribosome
the breakdown of rock material in its current location is known as? A. erosion B. weathering C. deposition D. landslide
A keystone species maintains the __ in the ecosystem. A. Energy B. Stability C. Producers
Answer:
i would say A energy
Explanation:
srry if i got it wrong but have a nice day
The skeletal system also helps us _____ muscles which are attached to bones by ______ makes our bodies move. Muscles, which are cause the bones to move, which makes our bodies move
Answer:
Dont open that link or they will track you down hope this help so you dont get kidnapped. :)
ask the question again in another one
Organisms that make a product like glucose are:
Please answer
Answer:
Photosynthetic organisms
Explanation:
Which statements describe components of fitness? (Select all that apply.)
• being free of physical and mental diseases
• performing muscular movement of the body that requires energy
• incorporating cardio and strength training into daily workouts
• having a large support system of friends and family
Answer:
performing muscular movement of the body that requires energy
• incorporating cardio and strength training into daily workouts
The components of the fitness includes performing muscular movement of the body that requires energy as well as incorporating cardio and strength training into daily workouts. The correct options are b and c.
What is fitness?Physical fitness is defined by professionals as "one's capacity to complete everyday tasks with optimized performance, perseverance, and strength while managing disease, exhaustion, and stress and reducing sedentary behavior."
Physical activity can enhance your brain health, assist you in controlling your weight, lower your risk of developing disease, fortify your bones and muscles, and improve your ability to do everyday tasks.
Individuals who sit very little and engage in moderate-to-vigorous physical activity reap health benefits.
Fitness includes performing muscular movements that require energy, as well as incorporating cardio and strengthening exercises into daily workouts.
Thus, the correct options are b and c.
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when a plant forms glucose molecules, what is its source of carbon atoms
Studies have shown that children are especially vulnerable to the effects of ultraviolet (UV) radiation. Tanning beds expose the skin to nearly ten times as much UV radiation as natural sunlight. With that knowledge, a law was passed in some states to prevent individuals under the age of 18 from using tanning beds. Which statement best explains why UV radiation is so harmful?
a) It can increase harmful DNA mutations in cells.
b) Diseases are all caused by exposure to environmental factors.
c) Homeostasis in an organism is increased by the presence of UV radiation.
d)UV Radiation decreases the likelihood that mutations will occur.
Hello there!!
The answer, I think, would be A.
UV radiation can create problems in the correctness of cell replication, which can result in mutated cells.
I hope this answers your question!
Tanning beds can increase harmful DNA mutations in cells. So, the correct option is A.
What are Tanning beds?In order to tan individuals, a tanning bed emits UV radiation (make their skin darker). If someone spends too much time in the tanning bed, it can also burn their skin, much like the sun. Many types of tanning beds exist. Using tanning beds can lead to more damaging DNA alterations in cells.
Special fluorescent lights (16–32 per tanning bed) that produce both visible and UV light are used in tanning beds. They employ a ballast system, like all fluorescent lights, to keep the amount of electricity going to each lamp to a maximum of 100 watts per lamp. A specific acrylic, or clear shield, is used over the bulbs in tanning beds.
Therefore, the correct option is A.
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Con ayuda de un microscopio se observa una bacteria en el agua transcurridas (2) se miran muchas bacterias . Que ocurrio alli ,que tpo de reproducccion sucedio meiosis o mitosis
Answer:
Ninguna de las dos. No ocurre ni mitosis ni meiosis.
Probablemente haya ocurrido fisión binaria/bipartición.
Explanation:
En este caso estamos hablando de bacterias, organismos unicelulares procariotas. Estos tienen una forma de reproducción asexual denominado fisión binaria. Los eucariotas por su parte pasan por periodos de división celular implicada en el crecimiento denominado mitosis, y división celular implicada en reproducción sexual, denominada meiosis.
La fisión binaria, también conocida como bipartición, si bien muy parecida a la mitosis en algunos aspectos, es la forma de reproducción de las bacterias.
Ambas, mitosis y fisión binaria, implican un duplicado de material genético. El ADN se duplica y una copia va a cada célula hija. Lo mismo sucede con el resto del contenido celular. Finalmente ocurre citocinesis. Sin embargo, a diferencia de la bipartición, la mitosis requiere de mecanismos mucho mas complejos de duplicación celular e involucra también a la cariocinesis, ausente en bacterias.
La fisión binaria ocurre muy rápidamente, en un breve período de tiempo puede hallarse una diferencia considerable en la cantidad de células presentes en un sustrato, producto de esta división. Es por esto que el crecimiento que exhiben las bacterias como población, sigue un modelo exponencial.
What types of molecules attach to receptor proteins found in the plasma membrane?
Answer:
Transport proteins, enzymes, receptors, recognition proteins and joining proteins.
Explanation:
Bacteria can reproduce by exchanging DNA. This exchange is called:
Binary Fission
Conjugation
Endospore production
Sexual reproduction
Answer:
conjugation
Explanation:
Bacteria reproduce by binary fission, resulting in two daughter cells identical to the parent cell. Bacteria can exchange DNA through the processes of conjugation, transformation, or transduction.
Primary decomposers are
select all that apply
fungi
plants
trees
bacteria
animals
What do transverse/Volkmann Canals do? and don't waste my point plz BRAINLES
The rabbit reproduces sexually. If the
parent cells have 16 chromosomes,
how many chromosomes do the rabbit
sex cells have?
how
can it be proved that leaves
prepare food? Describe experiment.
what is a turgid cell
Answer:
turgid refers to cells or tissues that are swollen from water uptake. Many cell types in many different organisms can become turgid due to water uptake. Some cells will lyse, or split open if they become too turgid.
Answer:
Explanation: turgid refers to cells or tissues that are swollen from water uptake. Many cell types in many different organisms can become turgid due to water uptake. Some cells will lyse, or split open if they become too turgid.
which of the following scientists can be identified as a taxonomist?
Answer: Taxonomy is the science of naming, describing and classifying organisms and includes all plants, animals and microorganisms of the world. Using morphological, behavioral, genetic and biochemical observations, taxonomists identify, describe and arrange species into classifications, including those that are new to science.
Which portion of a flowering plant absorbs water and minerals? *
A. stem
B. blade
C. root
D. flower
Answer: c
Explanation:
the roots absorb water and minerals from the soil and anchor the plant in the ground.
Which of the following correctly shows one path that energy would flow through this ecosystem?
Star grass — termite-wildebeest aardvark
O
Hyena — aardvark impala - harvester ant
О
Grasshopper termite-Warthog hare
O
Red oat grass — termite - wildebeest — lion
Answer: g
Explanation:
WHERE ARE THE THREE TYPES OF MUSCLES FOUND?
Answer:
This is the answer I found
hope it is useful for you