A region where old oceanic crust is being destroyed is called:
a. a spreading center.
b. a midocean ridge.
c. a seamount.
d. a subduction zone.
e. an atoll.
D
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Which of the following is least likely to be a cause of extinction?
a. asteroid impact b. human activity c. adaptive radiation d. continental drift e. climate change
Which of the following ultimately provides the O2 used during the process of oxidative phosphorylation
-fermentation -light reactions of photosynthesis -Calvin cycle of photosynthesis -Krebs cycle -carbon fixation
A type of lymphocyte called a(n) ________ detects cells with abnormal surface proteins and kills them
A) eosinophil B) NK cell C) neutrophil D) basophil E) mast cell
________ are glycoprotein spikes that protrude from the outer surface of the viral envelope.
Fill in the blank(s) with the appropriate word(s).