The developing embryo is termed a fetus at what stage?
A) After the third month
B) After implantation
C) At the ninth month of pregnancy
D) At the end of the second trimester
Correct Answer:
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Q13: The layer of cells called the endoderm
Q14: Sexual reproduction first evolved among the:
A)land-dwelling vertebrates
B)insects
C)amphibians
D)marine
Q15: The portion of the body that ultimately
Q16: All birds practice internal fertilization,even though most
Q17: A relationship between the developing embryo and
Q19: Ovulation in human females is triggered by:
A)a
Q20: Prior to ejaculation,mature sperm are stored where?
A)In
Q21: In humans,where does fertilization occur?
A)In the ovary
B)In
Q22: The secondary oocyte does not complete the
Q23: Skeleton,muscles,blood vessels and the heart develop from
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