The first step in changing atmospheric nitrogen into more usable NH3 is called ________
A) nitrification B) ammonification C) denitrification D) nitrogen fixation
D
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How much of the surface of the Earth do oceans cover, and what percentage of Earth's total water supply do they represent?
a. The oceans of the Earth collectively cover 97% of its surface, thus representing 97% of the Earth's total water supply. b. The oceans of the Earth collectively cover 71% of its surface, and represent 97% of the Earth's total water supply. c. The Earth's oceans cover 3800 square meters of the Earth, and represent 71% of the Earth's total water supply. d. The oceans of the Earth collectively cover 97% of its surface, and represent 71% of the Earth's total water supply. e. The oceans of the Earth collectively cover 71% of its surface, thus representing 71% of the Earth's total water supply.
Of the four alcohols with molecular formula C4H10O, how many are primary alcohols?
A) 1 B) 2 C) 3 D) 4
What characteristics have made arthropods the most successful phylum? How these animals grow? Can you think of any disadvantage of growing this way?
Folded limestones that are exposed high elevations in the Himalayas were originally deposited as sediments in a ________
A) deep ocean trench along the southern margin of India. B) Cenozoic fault basin between Africa and Arabia. C) late Paleozoic syncline north of the Tibetan Plateau. D) marine basin between India and Eurasia.