Speciation caused by a change in the course of a river is an example of ____ speciation
a. divergent
b. parapatric
c. allopatric
d. convergent
e. sympatric
ANSWER: c
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Nonpoint source pollutants include
(a) fertilizers from lawns. (b) pesticides from farm fields. (c) soil erosion from construction sites. (d) all of the above.
In the simplified prairie food chain illustrated in the pictures below, the letter D represents ____
a. tertiary consumer b. secondary consumers c. first trophic level d. primary consumers e. third trophic level
Sea cucumbers will __________ when environmental conditions deteriorate
a. eject their digestive tract, respiratory structures, and gonads. b. crawl to an area with more favorable conditions. c. form a resistant spore. d. float to the surface and then later drop to a more favorable location. e. crawl deep into the ocean mud on the bottom.
Adrenocorticotropic hormone (ACTH) triggers the release of _____ in response to stress.
Fill in the blank(s) with the appropriate word(s).