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
A
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We can say that biodiversity is a factor in maintaining life on this planet
Indicate whether the statement is true or false
Polyface Farm in the U.S. state of Virginia raises beef, chickens and pigs. A particular practice on Polyface Farm is to bring chickens into a pasture after the cows have eaten the grass
The chickens eat the insect grubs that are found in the cow manure. While the chickens fatten up on the insect grubs, they also produce waste which in turn fertilizes the grass the cows will later eat. Explain this process in terms of sustainable agriculture and the basic principles of sustainability. What will be an ideal response
The principle behind a hybrid electric vehicle is that it
A) runs with conventional fuel but the motor shuts off when going downhill. B) has a battery-powered electric motor in addition to a conventional engine. C) has a small nuclear reactor in addition to a conventional engine. D) runs on its electric battery except when starting the engine or travelling at speeds in excess of 90 mph.
Mafic rocks contain about ________% silica.
A. 50 B. 10 C. 80 D. 25 E. 65