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Mumz [18]
3 years ago
11

When researchers use a molecular clock what are they measuring?

Biology
2 answers:
choli [55]3 years ago
7 0
Measures time from random changes (mutations) 
Tasya [4]3 years ago
5 0

They are measuring the time that two species have been evolving independently.

A molecular clock is a method that is used by scientists to estimate the time that two species evolve separately using the knowledge of the DNA differences. To carry out this method, scientists use (i) an estimate of the number of genetic mutations that occur between two closely related species and (ii) the average genetic mutation rate to estimate the time in prehistory when the two species split.

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Answer:

A callus is a hardening of skin, keratin is the protein which is abundant in callus. Skin is a protective layer against a external environment. Outer layer of skin consist of keratin which is also found in hair. Callus is the accumulation of dead cells result due to friction and pressure exerts on the part in which they are present. The keratin component (keratinocytes) remains undifferentiated in these dead cells which causes hardening in callus.

6 0
3 years ago
Which of the following best describes Samuel Gompers?
xxTIMURxx [149]

Answer:

Option D

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Thus, Samuel arouses his voice to stand against the injustices done to the workers in cigar factory which later turned out to be mass movement.

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