__________, such as jellyfishes, corals, and sea anemones, are radially symmetrical.
Fill in the blank(s) with the appropriate word(s).
Cnidarians
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How does DDT in the environment affect many birds?
A. stunted growth of chicks B. chronic liver failure in adults C. advancing neurological degeneration D. failed reproduction E. None of these choices are correct
Which cell is the most abundant in the human body?
a. lymphocytes b. basophils c. erythrocytes d. neutrophils e. platelets
A species of cattail inhabits both deep and shallow water in the absence of a competitor but only shallow water in the presence of it. This is an example of
A) a realized niche. B) a fundamental niche. C) carrying capacity. D) coevolution.
Figure 22.18
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Refer to the above figure for questions.
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Which numbered item in the above figure represents a female gametophyte?
A. 1 B. 2 C. 3 D. 4 E. 5