As a result of concussions, former football players have an elevated risk for ____
a. spinal cord injury
b. Huntington disease
c. amyotrophic lateral sclerosis
d. Alzheimer's disease
e. multiple sclerosis
ANSWER: d
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Each of the following is an ahermatypic coral except:
a. gorgonians. b. black corals. c. plate corals. d. soft corals.
If an investigator removes the mesoderm from an
embryo, the development of which of the following systems is least likely to be affected? a. circulatory system b. muscle system c. reproductive system d. integumentary system e. excretory system
True multicellularity is a major characteristic of
A. all eukaryotes and a few prokaryotes. B. protists, plants, and animals. C. prokaryotes and protists. D. animals and plants only. E. eukaryotes only.
An atom can get rid of vacancies by participating in a ___________.
A. cell bond B. physical bond C. chemical bond D. magnetic bond E. electric bond