The graph below shows the rate of cell division in a developing frog embryo.
Why does the rate of growth decrease dramatically after the point indicated by the arrow?
A)At this point, development switches from rapid cell growth to cell differentiation and migration.
B)The arrow indicates when the embryo begins to run out of its internal food source and must find another source to continue developing.
C)This is when fertilization occurs. Before this point, the single-celled egg was growing quickly as it stored food. After this point, growth slows for the more deliberate process of development.
D)At the time indicated by the arrow, the trophoblast separates from the inner cell mass and the two tissues begin to divide at different and slower rates.

Question

The graph below shows the rate of cell division in a developing frog embryo. 
Why does the rate of growth decrease dramatically after the point indicated by the arrow?
A)At this point, development switches from rapid cell growth to cell differentiation and migration. 
B)The arrow indicates when the embryo begins to run out of its internal food source and must find another source to continue developing. 
C)This is when fertilization occurs. Before this point, the single-celled egg was growing quickly as it stored food. After this point, growth slows for the more deliberate process of development. 
D)At the time indicated by the arrow, the trophoblast separates from the inner cell mass and the two tissues begin to divide at different and slower rates.

Quizplus · Accepted Answer

The graph shows a rapid increase in cell division rate followed by a dramatic decrease. This corresponds to the change from the early stages of development where the embryo is rapidly dividing cells to later stages where cells are differentiating and migrating to form tissues and organs.

The Graph Below Shows the Rate of Cell Division in a Developing