____________________ that impart greater ____________________ to an individual become more common in a
population over generations, compared with less competitive forms.
Fill in the blank(s) with the appropriate word(s).
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A floodplain is an area adjacent a stream or river that experiences flooding during periods of high discharge. These ecosystems can be very rich in both quantity and diversity of organisms and can contain up to 1,000 times more species than a river. Many floodplains have been compromised by the construction of levees, pollution, and the draining of wetlands and marshes. A restoration project that focuses its efforts on the removal of levees and the improvement of water quality, is a plan focused on
A. restoration of species. B. restoration of ecosystem functioning.
Which structure is used to help regulate buoyancy of fish?
a. kidney b. stomach c. intestine d. swim bladder e. ureter
The highest amount of oxygen will be found in soils containing large amounts of _____
A) clay B) sand C) gravel D) silt
Fortunately, the difference-in-differences estimate of a treatment effect also can be reported/interpreted as:
A. the coefficient on an interaction term. B. the ratio of t-stats. C. the second stage estimates of two-stage least squares. D. a simple difference in mean outcomes.