When scientists compare molecular clocks between species, they have to use the same segment of DNA. Which of these statements would explain why that is necessary?
A.
Not every segment of DNA mutates
B.
Different genes mutate at different rates.
C.
Species accumulate neutral mutations at random rates.
D.
All mutations cause harmful effects.

Describe how a non-resistant staphylococcus aureus bacterium can produce a bacterium that is resistant to methicillin

Which could be a pathway of food through an ecosystem

Do the following statements describe actin, myosin, both of the proteins or neither of the proteins? (a) contains a binding site for calcium (b) found in the i band (c) exists in a globular (g) form and a filamentous (f) form (d) contains a binding site for atp (e) is a component of the thin filament (f) is a component of the thick filament