All birds practice internal fertilization,even though most male birds lack a penis.
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Q11: Choose the most effective means of birth
Q12: During the third trimester of development,the major
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
Q17: A relationship between the developing embryo and
Q18: The developing embryo is termed a fetus
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
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