Which of the following is not an economic service provided by marine ecosystems?
a. source of animal and pet feed
b. nutrient cycling
c. provides harbors and transportation routes
d. provides employment
e. source of minerals, oil, and natural gas
B
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Large areas of farmlands, woodlands, and green spaces in the United States have been protected by private, nonprofit groups called
A. urban green space. B. ecologists for conservation. C. debt-for-nature. D. land trusts. E. biosphere conservation.
A salmon migrates from the ocean to freshwater rivers to spawn. What is the freshwater environment like for the salmon?
A) Hypertonic B) Hypotonic C) Isotonic D) None of these choices
Air can hold more water vapor when it is _________.
Fill in the blank(s) with correct word
What might happen to a losing stream as the water passes from flowing over hard, impermeable rocks to flowing over more permeable rocks?
A. No change will occur in the stream flow. B. The stream will gain water and flow faster. C. The stream will lose more water to the subsurface and might disappear.