During the development following fertilization, the morula becomes a hollow ball of cells called the
A) conceptus.
B) fetus.
C) germ layer.
D) blastocyst.
E) secondary morula.
Correct Answer:
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Q12: A zygote forms when
A) the nucleus from
Q13: The first four days of human embryonic
Q14: When a sperm cell enters a secondary
Q15: The blood vessels of the umbilical cord
Q16: All of the following processes are associated
Q18: Most sperm cells die in the vagina
Q19: The placenta forms from embryonic tissue and
A)
Q20: In humans, fertilization usually occurs _ after
Q21: With the exception of cancer cells, most
Q22: All of the following can pass through
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