6. All of the following occur during the cleavage stage of animal development EXCEPT (A) an increase in the nuclear-to-cytoplasmic ratio of the cells (B) an increase in the number of blastomeres (C) an increase in the mass of the embryo (D) an increase in the surface-to-volume ratio of the cells (E) rapid cell divisions

7. The logistic equation on the right is used to describe the rate of change of a population, N, with time, t, where r is the intrinsic rate of increase and K is the carrying capacity. Which of the following statements is true for this equation? (A) For a given population, r is variable. (B) For a given environment, K is variable. (C) As Napproaches K, dN/dt approaches 0. (D) As N approaches K, dN/dt approaches K. (E) As N approaches K, dN/at approaches r.

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