A Zygote Is Formed at This Stage

Q7: Gastrulation produces<br>A) hollow balls of cells.<br>B) embryos

Q12: Which of the following developmental events occurs

Q13: In frogs, the gray crescent appears<br>A)after the

Q14: Which of the following is a single-layered,

Q16: Organ formation is indicated by<br>A)A.<br>B)B.<br>C)C.<br>D)D.<br>E)E.

Q17: A zygote forms<br>A)as soon as a sperm

Q19: Muscles differentiate from which tissue?<br>A)ectoderm<br>B)endoderm<br>C)mesoderm<br>D)somatoderm<br>E)all of these

Q20: Which stage of development involves initial cellular

Q20: The primary tissue layers are formed in

Q68: Which embryonic tissue is incorrectly associated with