Dr. Moore is growing skin cells in a petri dish. When the cells get too large, they divide. When the cells detect that a space has become crowded, they signal each other to
A. move away
B. merge
C. stop dividing
D. disintegrated

PLS HELP

In the family tree below, people with the recessive trait of attached earlobes are shaded gray.

What will happen to a population of predators if there is a sudden, temporary increase in the number of prey? a. the population of predators will be uniform with no change. b. the population of predators will increase first and then decrease slowly. c. the population of predators will increase continuously.

How can you tell the difference between rough er from smooth er?