The life cycle of the human liver fluke has intermediate hosts
a. one.
b. two.
c. three.
d. four.
d
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What will be an ideal response?
Darwin observed an orchid flower with petals arranged in very long, thin tubes, rather than broad and flat, as we might see in other common flowers. What is the advantage to the orchid having an 11-inch-long nectar tube arrangement of the petals?
A. The long tube can trap insects as a source of nutrients. B. The flower can collect more sunlight for photosynthesis. C. The flower can produce nectar more easily spread over a larger area to attract more pollinators. D. The flower nectar tube can collect more rainwater to maintain health of the flower. E. The flower can only be pollinated by a specifically adapted pollinator, reducing cross-fertilization among orchid species.
In a population of bears, which is most likely to be considered to have the greatest Darwinian fitness?
A) the biggest bear B) the bear having the largest number of mutations C) the bear that blends in with its environment the best D) the strongest, fiercest bear E) the bear that leaves the most descendants
A stratified water column consists of ________ called the epilimnion and ________ called the hypolimnion
a. warmer, denser water / colder, less dense water b. colder, less dense water / warmer, denser water c. warmer, less dense water / colder, denser water d. colder, denser water / warmer, less dense water