Which of these extinction events was the largest?
a. late Devonian extinction
b. Ordovician-Silurian extinction
c. end-Permian extinction
d. Triassic-Jurassic extinction
c. end-Permian extinction
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____ is an element that is abundant in Earth's atmosphere; however, usable forms of this element (such as ammonia) are comparatively rare in certain soils. To circumvent this problem, soybean plants form symbiotic relationships with bacteria
Fill in the blank with the appropriate word.
From the back of the mouth to the front, the correct order of human teeth is ____
a. molars; premolars; canines; incisors b. premolars; molars; canines; incisors c. canines; incisors; premolars; molars d. molars; canines; premolars; incisors e. incisors; canines; premolars; molars
Hydrogen bonding is most important in stabilizing the ________ structure of many proteins
A) primary B) secondary C) tertiary D) quaternary E) primary, secondary, tertiary, and quaternary
FAD, NADP, and NAD are all ________ carriers.
A. ATP B. electron C. hydrogen D. both hydrogen and electron