Humans are susceptible to scurvy because
A. they cannot synthesize amino acids.
B. they do not have enough adipose tissue for vitamin A storage.
C. they cannot synthesize vitamin C.
D. they have a high incidence of fruit allergies.
E. constant seasickness and nausea on long voyages leads to weakness and anemia.
C. they cannot synthesize vitamin C.
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Which group underwent a large increase in diversity during the Cambrian explosion?
A) animals B) plants C) fungi D) bacteria
Bacterioplankton (floating bacteria) use ________ as a sulfur source for protein synthesis.
What will be an ideal response?
Organisms that require organic sources of carbon and energy are called (autotrophs /chemoautotrophs/chemoheterotrophs /).
Fill in the blank(s) with the appropriate word(s).
What is the purpose of dialysis treatments?
A) To constrict blood vessels to prevent death from anaphylactic shock B) To detoxify dangerous chemicals in the bloodstream C) To replenish oxygen in the bloodstream D) To keep the airways open so one can breathe