What pattern of cleavage is characteristic of mammals?
A. Holoblastic cleavage with eggs containing very little yolk, but with the inner cell mass distributed uniformly
B. Some yolk, and cleavage resulting in vegetal and animal poles
C. Holoblastic cleavage with eggs containing little or no yolk
D. Holoblastic cleavage with eggs containing very little yolk, but with the inner cell mass concentrated at one pole
E. Meroblastic cleavage with eggs containing almost entirely yolk
Answer: D
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