Tom Curtis wrote a letter in 2006 to try and
encourage research into
a. rare plants.
b. microorganisms.
c. agricultural crops.
d. prairie grasses.
e. all of these.
Answer: b
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Ammonia is the most toxic of the three major forms of nitrogenous waste
A. true B. false
Four of the five processes below are components of natural selection. Select the exception
a. genetic drift b. overproduction of offspring c. limitations in vital resources d. genetic variation e. differential reproductive success
The opening and closing of stomata is regulated by changes in
A. water pressure in guard cells B. mesophyll cella wall thickness C. the number of stomata D. chloroplast function
The side toes of a horse, the pelvis of the whale, and the human appendix are all examples of structures that resemble structures of presumed ancestors, which are known as
A. analogous structures. B. homologous structures. C. acquired structures. D. vestigial structures. E. homeotic mutations.