38) I believe the correct answer would be letter D: ions are moved against the concentration gradient.
39) I believe the correct answer is letter A: the DNA information for development was silenced in differentiated cells. This is because the frog did not go through <span>embryonic development.</span>
(1952) to be present on the early Earth and tested the chemical origin of life under those conditions.
The answer is a. minimizes the chance of accidents occurring in the lab.
Technically, the answer could be c, because the point of safety rules is to stop accidents from happening, but accidents can still occur EVEN when you are following the rules.
Abiotic means anything living and abiotic means not living
E. <span> When they stop dividing, they do so at random points in the cell cycle; they are not subject to cell cycle controls; and they do not exhibit density-dependent inhibition when growing in culture.
Hope this helps(:</span>
