Coevolution would be expected to occur between all of these relationships except
a. predator and prey.
b. parasite and host.
c. mutualistic relationships.
d. interspecific competitors.
e. commensal relationships.
E
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Use of the illegal drug Ecstasy can result in ________
a. possibly fatal rise in body temperature only b. memory loss only c. feelings of acceptance and empathy only d. all of the choices
Which of the following do lobsters and clams
have in common with fishes?
a. an exoskeleton b. a two-chambered heart c. internal gills d. skin as a respiratory surface e. more than one of these
In an annual tree ring, the wood with large diameter, thin-walled cells is ____
a. called early wood b. heartwood
c. formed from crushed phloem cells d. produced in the winter e. called late wood
Which is not true of placoderms?
a. They gave birth to live young. b. They had jaws. c. They had teeth. d. They had paired pelvic fins. e. They had paired pectoral fins