The gray crescent in frogs
A) stimulates zygote formation.
B) stimulates zygote development.
C) establishes the frog's head-to-tail axis.
D) is not related to gastrulation.
E) triggers tissue specialization.
Correct Answer:
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Q4: Select the correct sequence of animal developmental
Q6: Which stage of development involves initial cellular
Q16: Gastrulation produces
A) hollow balls of cells.
B) embryos
Q18: Organs gradually assume specialized functions at this
Q20: The heart, muscles, bones, and blood develop
Q21: Muscles differentiate from which tissue?
A)ectoderm
B)endoderm
C)mesoderm
D)somatoderm
E)all of these
Q22: If an investigator removes the mesoderm from
Q23: The mesoderm is responsible for the formation
Q26: In frogs, the gray crescent appears
A)after the
Q27: Which of the following events occurs over
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