Bilateral symmetry is characteristic of
a. cnidarians.
b. sponges.
c. jellyfish.
d. flatworms.
e. corals.
Answer: d
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Which of the following reproductive barriers actually prevents individuals of different species from mating with each other?
a. gametic isolation b. behavioral isolation c. hybrid sterility d. hybrid breakdown e. hybrid inviability
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A. Connective Tissue B. Cytotrophoblasts C. Endothelium of Fetal Capillaries D. Endothelium of Maternal Capillaries E. Syncytiotrophoblasts
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