A company is growing algae in big tanks to make fish food. However, the algae is not growing very quickly, and they suspect either phosphorus, nitrogen, or iron is limiting. What could the company do to figure out which nutrient is limiting?
a. Add phosphorus to one tank, nitrogen to another, and iron to a third, and see which treatment increases algal growth.
b. Add phosphorus, iron, and nitrogen to all tanks, and see which nutrient increases algal growth.
c. Add phosphorus to all tanks, because phosphorus is the nutrient that limits algal growth.
d. Add nitrogen to all tanks, because nitrogen is the nutrient that limits algal growth.
a. Add phosphorus to one tank, nitrogen to another, and iron to a third, and see which treatment increases algal growth.
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Which phase of the above-described situation could be called computer simulation?
a. when the scientists gathered woodrat dropping for lab analysis b. when the scientists learned from the computer that woodrat nest numbers would impact cactus populations c. when the scientists first observed the proximity of woodrat nests and cactus plants d. all of these answers e. none of these answers
Dark energy bends the curvature of spacetime
A. in the opposite manner of gravity. B. in the exact same fashion as gravity. C. by absorbing all lightwaves that pass through it. D. Dark energy does not bend the curvature of spacetime.
An El Niño usually results in
A. more rainfall for South America B. warmer water in the western Pacific C. less rainfall for Australia D. all of the above
Hunters and gatherers may have been the "original affluent society" as they maintained a balance of harmony with the natural world, religion, and ample leisure time
Indicate whether the statement is true or false