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laila [671]
3 years ago
14

How might life on earth be different today if mass extinctions never occurred ?

Biology
1 answer:
Usimov [2.4K]3 years ago
7 0

Answer: There would be varied mass population

Explanation: The population would consist of many people since they do not die

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Not sure about this probably simple bio question
insens350 [35]

Answer:

It should be the reptile at the top right of the picture

Explanation:

Some reptiles do not go over India (including the two at the bottom)

3 0
3 years ago
Interstitial cells produce?
Elanso [62]

Answer:

The correct answer is option E (testosterone).

Explanation:

The interstitial cells or Leydig cells are the individual or group of cells present in loose connective tissues surrounding the seminiferous tubules.

They are usually active in the production of dominant sex hormones in males that is testosterone responsible for male secondary sexual characteristics.They produce hormones in the presence of luteinizing hormone (LH) and growth hormone released by the pituitary gland.

The high cholesterol content and crystals of Reinke make the leydig cells appear pale in color.

Thus, option E- testosterone is the correct answer.

7 0
4 years ago
Which of these is part of the biosphere? Wind? Lakes? Bacteria? Glaciers?
mixer [17]
Includes all of the living organisms on earth so it should be glaciers
6 0
4 years ago
Read 2 more answers
Enzymes speed chemical reactions by
masha68 [24]
A. Decreasing amount of energy needed to start a reaction.
8 0
4 years ago
Oct4 is an embryonic stem cell specific transcription factor. ESCs grown in petri dishes are fed media that contain basic fibrob
GarryVolchara [31]

Answer:

miR-223 inhibits the expression of the fibroblast growth factor (bFGF) gene, and thereby ESCs cells maintain their undifferentiated state .

Explanation:

Non-coding RNA (ncRNAs) are molecules that regulate gene expression, thereby playing important biological functions in cell differentiation, cell cycle, apoptosis, etc. MicroRNAs (miRNAs) are a type of ncRNAs capable of controlling gene expression patterns by regulating mRNA stability and by suppressing their translation into proteins. It has been shown that miRNAs function by imperfectly base-pairing with the 3′ UTR of target mRNAs (Pillai et al. 2005).

Citation:

R. S. Pillai, S. N. Bhattacharyya, C. G. Artus,   T.  Zoller, et al. (2005). Inhibition of translational initiation by Let-7 MicroRNA in human cells. Science, 309(5740), 1573-1576.

4 0
3 years ago
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