Echinoderms are classified as Bilateria, but although they start out as bilateral larvae, they change into radially symmetrical adults. You might hypothesize that their genes controlling the development of radial symmetry are
A. different from those controlling development of symmetry in all other radially symmetrical animals.
B. similar to genes controlling body form in Porifera.
C. similar to genes controlling body form in Ctenophora.
D. similar to genes controlling body form in Lophotrochozoa.
E. similar to a common set of genes controlling body form in Ctenophora and Lophotrochozoa.
A. different from those controlling development of symmetry in all other radially symmetrical animals.
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Athletes who take synthetic steroids can become sterile due to lack of sperm production. This is because of negative feedback on which of the following?
A. the epididymis B. the testes C. the vas deferens D. the prostate E. the hypothalamus
What factor(s) typically influence a trait that shows continuous variation?
A) genetic factors only B) environmental factors only C) both genetic and environmental factors D) neither genetic nor environmental factors
Why are most weight-loss programs typically ineffective?
What will be an ideal response?
What situation causes stress to reefs?
A. A parasitic relationship with dinoflagellates B. Clear waters in which all nutrients have settled C. Decline in fishing operations D. Lowering of sea level due to climate changes E. Pollutants released in coastal waters