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

question 5

Multiple Choice

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.

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