A blastula that is spherical in shape, with blastomeres of approximately equal size in a single layer around the central blastocoel, is most likely to be that of a
A) frog.
B) bird.
C) sea urchin.
D) marsupial.
E) mouse.

Question

Quizplus · Accepted Answer

The description matches the blastula stage of a sea urchin, which is known for having a spherical shape with equally sized blastomeres surrounding a central blastocoel. This is characteristic of many echinoderms, including sea urchins, during their early embryonic development.

A Blastula That Is Spherical in Shape, with Blastomeres of Approximately