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patriot [66]
4 years ago
11

How do scientists know that dark matter and dark energy exist even if we can not see them

Biology
1 answer:
Gre4nikov [31]4 years ago
7 0

Answer:

We only know it's there because we can see the effect of its gravity. Scientists study dark matter by looking at the effects it has on visible objects. Scientists believe that dark matter may account for the unexplained motions of stars within galaxies. Computers play an important role in the search for dark matter information.

Explanation:

Hope That helps!

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Creates sex cells and offspring is which human organ system?
tangare [24]
(sex cells )reproductive system....offsprings the adrenal gland just located above the kidney
8 0
4 years ago
A researcher has identified a mutant strain of yeast whose histones are unable to be acetylated. Which of
d1i1m1o1n [39]

Answer:

The correct answer is c the mutant will show decreased levels of gene expression.

Explanation:

Histone acetyl transferase is an enzyme that helps in the transfer of acetyl group to the epsilon -NH2 group of lysine reside of histone proteins that surrounds the DNA molecule of chromosome.

  This results to make the target DNA more assecible for transcription mediated by RNA polymerase resulting the gene expression.

 On the other hand the mutant in which histones are not acetylated,transcription rate decreases as the non acetylated DNA is less assecible to RNA polymerase.

4 0
3 years ago
Choose all the answers that apply.
ella [17]

Answer: Based on fact, Free from bias, objective

Explanation:

8 0
3 years ago
The more similar the DNA sequences of two species are, the more closely related the species are. Please select the best answer f
erica [24]
Alright my friend the answer to your question will be true let's put an example in to inform why it is alright so say you and your cousin look a like that's because the genetics are similar but not exactly the same
6 0
4 years ago
Mammals in Australia are called marsupials, and diverged from the placental mammals very early in mammalian evolution. Australia
mamaluj [8]

Answer:

The correct answer is homologous.

Explanation:

A structure that is derived from a common ancestor is called homologous structure. So homologous structure is the characteristic of divergent evolution that means divergent evolution give rise to homologous structures.

So as the marsupials are mammals that were diverged from placental mammals very early in mammalian evolution, the membranes of skin that allow Australian sugar gliders and North American flying squirrels to glide are homologous because divergent evolution gives rise to homologous structures.

The function of these homologous structures can be the same or can be different. Therefore the correct answer is their membrane are homologous.

7 0
3 years ago
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