The female erectile structure analogous to the male glans penis is the:a
vulva.
b. labia majora.
c. mons pubis.
d. hymen.
e. clitoris
e
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The muscles of the body wall are derived mainly from which embryonic cell layer in most
eumetazoans?
a. mesoderm b. epiderm c. mesoglea d. endoderm e. ectoderm
________ discovered that soil bacteria could oxidize iron, sulfur, and ammonia to obtain energy.
Fill in the blank(s) with the appropriate word(s).
One reason that atrazine, an herbicide in use for more than 40 years, is an environmental problem is that it ____
a. raises the level of air pollution b. poses a substantial contribution to greenhouse gases c. disrupts the stratospheric ozone level d. is responsible for the extinction of bee colonies e. is an endocrine disrupter and can reduce reproductive capacity in aquatic animals
On average, which leaves more offspring that survive to become adults and reproduce: a pair of elephants or a pair of rabbits?
a) if both populations are stable, then the pair of elephants and the pair of rabbits s will leave the same number of offspring that survive to become adults and reproduce b) the pair of elephants will leave more, because any individual elephant born is more likely to survive to become an adult and reproduce c) the pair of rabbits will leave more, because they have so many more offspring per breeding season than do the pair of elephants d) the pair of elephants will leave more, because elephants live much longer and have more breeding seasons e) the pair of rabbits will leave more, because they reach sexual maturity more rapidly