Coyote populations are lower where wolf populations are increasing because
A) wolves directly compete with coyotes.
B) wolves are a primary predator on coyotes.
C) wolves can withstand colder temperatures than coyotes.
D) wolves facilitate coyote populations by leaving scavenged meat.
A
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Steroid hormones ____
a. are proteins b. include testosterone, estrogens, and cortisol c. never activate second messengers d. never alter membrane transport of ions e. are large nonpolar molecules
Female silkworm moths produce a ____ signal referred to as bombykol, which generates a message in specialized
receptors on the antennae of any male silkworm moth that is downwind.
a. chemical b. visual
c. electrical d. acoustical e. tactile
Which of the following is a characteristic of all fungi?
a. They are prokaryotic consumers. b. They break down food externally. c. They actively move during part of their lives. d. They make their own food. e. They are multicelled.
In general, the frequency with which crossing over occurs between two linked genes depends on _________.
A. the phase of meiosis in which the crossing over occurs B. whether the genes are on the X chromosomes or not C. how far apart they are on the chromosomes D. whether the genes are dominant or recessive