Plant roots absorb nitrate or ammonia and incorporate these compounds into plant proteins via the process of:
a. ammonification.
b. denitrification.
c. assimilation.
d. nitrogen fixation.
e. nitrification.
c
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Which is an example of a eudicot?
a. orchid b. palm c. wheat d. corn e. cactus
Motor neurons serving smooth and cardiac muscle are part of the somatic nervous system.
a. true b. false
North America is currently experiencing an unprecedented and rapid loss of species. What is believed to be the main trigger of such events, either directly or indirectly?
A) continental drift B) increased human population C) climate change D) increased predation by wild carnivores
The French naturalist who in 1749 became one of the first scientists to suggest that closely-related species arose from a common ancestor and were changing was
A. Charles Darwin. B. Georges Buffon. C. James Hutton. D. Georges Cuvier. E. Charles Lyell.