In animals,indirect development
A) occurs only in mammals.
B) lacks a larval stage.
C) involves a larval stage.
D) occurs only when eggs develop without being fertilized.
Correct Answer:
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Q15: The product of cleavage in a zygote
Q16: What prevents a foreign species' sperm from
Q17: The effect of yolk on cleavage is
Q18: Before fertilization,as an egg cell matures,its nucleus
Q19: Generally,only one sperm fertilizes an egg because
A)there
Q21: When the central mass of yolk restricts
Q22: The allantois
A)becomes the chorionic villi.
B)lies next to
Q23: The difference between primary and secondary induction
Q24: The placenta develops from
A)fetal membranes only.
B)maternal tissue
Q25: The conclusion of Spemann's work,in which he
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