A scientific explanation that is conditional and requires more investigation is called a(n)
A) theory. B) hypothesis. C) control. D) fact. E) observation.
B
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Some species of insects are able to walk across liquid water because of the:
A. high specific heat of water B. low gravitational effect of their body weight relative to the amount of water C. higher density of liquid water compared to solid water D. capacity of water to function as a solvent E. high surface tension of water due to its cohesion
A stool specimen is examined, and the following characteristics are observed: • 15 to 18 lateral branches on each side • Scolex with four suckers • No hooklets The intermediate hosts of this tapeworm are:
a. cattle. b. humans. c. cats. d. swine.
In which demographic model is population growth the fastest?
a. pre-industrial b. transitional c. industrial d. postindustrial e. transformational
What type of speciation requires a geographic barrier?
A. sympatric speciation B. allopatric speciation C. Both sympatric and allopatric speciation require a geographic barrier. D. Neither sympatric or allopatric speciation require a geographic barrier.