Mistletoe is a plant that grows commonly on
the limbs of hawthorn trees and extracts
nutrients from its host plant. The relationship
between mistletoe and the hawthorn tree is
a. commensalism.
b. mutualism.
c. competition.
d. predation.
e. parasitism
E
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Which class of antibody accounts for the bulk of the circulating antibody?
A. IgA B. IgD C. IgG D. IgE
The ________ of the microscope holds and allows selection of the objective lenses.
A. condenser B. ocular C. stage D. nosepiece
The metabolic reactions that occur in all cells require a certain molecule that was also believed to be present very early on Earth. What is this molecule?
a. nitrogen b. carbon c. water d. oxygen e. hydrocarbon
Components of vertebrate plasma include
A. red blood cells. B. water. C. nutrients. D. oxygen. E. white blood cells.