Adaptive radiation is often the result of
A) lack of predation.
B) excess nutrients.
C) resource competition.
D) abiotic factors.
C
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What do all deuterostomes have in common?
A) Adults are bilaterally symmetrical. B) Embryos have pharyngeal pouches that may or may not form gill slits. C) All have a spinal column. D) All have specialized head and tail regions. E) The pore (blastopore) formed during gastrulation becomes the anus.
Ligers, the offspring from the mating of a lion and a tiger, are sterile. This is an example of
(A) geographic isolation. (B) hybrid infertility. (C) gametic incompatibility. (D) mechanical incompatibility. (E) behavioral isolation
A cheetah is chasing a gazelle. What division of the vertebrate nervous system is regulating the stress response in both animals?
The PNS comprises the somatic (voluntary) and autonomic (involuntary) nervous systems. The sympathetic division of the autonomic nervous system activates the body for fight-or-flight responses. The parasympathetic division generally promotes relaxation and digestion (or "rest and digest"). A. somatic nervous system B. parasympathetic nervous system C. sympathetic nervous system D. parasymbiotic nervous system E. cerebral cortex
Which of the following is a true statement about cycads?
a. Cycads can be pollinated by beetles. b. Cycads are the most common gymnosperm. c. Cycad leaves are a source of ephedrine. d. Cycads have only one surviving species.