The best definition of antigen is
A) Something foreign in the body.
B) A chemical that elicits an antibody response and can combine with these antibodies.
C) A chemical that combines with antibodies.
D) A pathogen.
E) A protein that combines with antibodies.
Ans: B) A chemical that elicits an antibody response and can combine with these antibodies.
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The organisms of the intertidal are subject to daily changes in all except:
a. exposure to air. b. desiccation. c. wind and waves. d. low light levels. e. heat.
All of the populations of different species that occupy and are adapted to a given area are known as ____.
A. the biosphere B. a community C. an ecosystem D. a niche E. the habitat
Which tissue type will move the body? a. Muscle b. Nerve c. All of these choices
d. Epithelial e. Connective
The study of the observable is
a. science. b. optics. c. hypothesis. d. critical thinking. e. visualization.