The prenatal period begins with the ____ and ends after ______.
A. zygote; birth
B. blastocyst; gastrula
C. embryo; fetus
D. fetus; infant
E. zygote; fetus
Answer: A
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A special workbook that may include formatting, formulas, and other elements and is used as a pattern for creating other workbooks.
a. Template b. Data series c. Chart book
Convergent evolution occurs when two species living in
A. the same area become reproductively isolated. B. different areas become reestablished and are able to reproduce. C. the same area are competing for the same resource thus causing one to evolve away from the other. D. different areas evolve similarities through natural selection acting on those characteristics.
Why did animal life probably diversify during the "Cambrian explosion"?
a. predator-prey relationships stimulated animal diversity b. changing sea levels increased available land for animal habitat c. increases in atmospheric oxygen allowed larger body sizes d. the permian extinction left many vacant niches e. A and C
A zygote with animal and vegetal poles demonstrates what characteristic of some animal zygotes?
What will be an ideal response?