How is atmospheric nitrogen converted to a usable form in the biosphere?
A) Atmospheric nitrogen is directly available to plants and animals.
B) Atmospheric nitrogen is completely unavailable to plants and animals and, as a result, synthetic fertilizers must be used.
C) Bacteria within root nodules of legumes chemically combine the atmospheric nitrogen into nitrates and ammonia.
D) It is absorbed into plants via stomata and converted within the plant to a usable form.
C
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The most prosperous part of China is the interior
Indicate whether the statement is true or false.
Which of the following rock types requires dissolved gas in the magma?
A. gabbro B. diorite C. andesite D. pumice E. granite
Which piece of glassware do we need to accurately measure the total volume of a solution of a specific molarity?
A) a graduated cylinder B) a volumetric flask C) a volumetric pipet D) Any of these would be appropriate.
Venus is the only planet in the solar system that rotates clockwise, or opposite the other planets. Which of the following is the most accepted scientific explanation for this?
A. Venus is denser than the other planets, which causes it to rotate in an opposing direction. B. Early in the history of the solar system, Earth and Venus were so close to each other that their gravitational attraction caused them to spin in opposing directions. C. Venus lacks a moon, which causes it to behave differently from the other planets. D. Venus did not form with the rest of the planets, but was a stray asteroid that was captured by the Sun's gravitational field. E. Early in the history of the solar system there was a large impact that reversed the direction of Venus' spin.