The nervous system
a. acts only to adjust the contraction of skeletal muscle.
b. initiates the rate and strength of cardiac contraction.
c. can only adjust the rate and strength of cardiac contraction.
d. has no direct control at all over cardiac function.
e. acts only to adjust the contraction of smooth muscle.
C
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Which statements about the Lake Victoria cichlid fishes are true? Check all that apply.
__X__ The adaptive radiation of the estimated 300 species of cichlid fish was very rapid and took place during the last 200,000 years. _____ The adaptive radiation of the Lake Victoria cichlids may have resulted from a key evolutionary innovation. _____ Speciation of the Lake Victoria cichlids was mainly sympatric. _____ The diversity of the Lake Victoria cichlids continues today because the lake is devoid of predators. _____ Many of the Lake Victoria cichlids have very specialized adaptations that allow them to occupy diverse habitats within the lake.
What morphologic feature is a major consideration in determining an identification scheme for streptococci?
a. Colony shape and color b. Hemolytic pattern c. Smell d. Consistency
Gene flow between organisms of ring species occurs
a. between any of the organisms if they are placed in the same environment. b. freely. c. never. d. only between intermediary populations. e. only under laboratory conditions.
The crab industry needs female crabs for growing more crabs. What bacterium might be used to ensure development of female crabs and shrimp?
A) Acinetobacter B) Gemmata C) Neisseria D) Pelagibacter E) Wolbachia