__________ are parasites that infect humans and, as adults, reside in the small intestines of the host

A. Pinworms
B. Ascarid worms
C. Trichina worms
D. Rotifers
E. Caenorhabditis elegans


B

Biology & Microbiology

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Neurotransmitters affect postsynaptic cells by _____

I) initiating signal transduction pathways in the cells II) causing molecular changes in the cells III) affecting ion-channel proteins IV) altering the permeability of the cells A) I and III B) II and IV C) II and III D) III and IV E) I, II, III, and IV

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Most of the animals living in the rocky intertidal are:

a. infaunal. b. epifaunal. c. epiphytic. d. meiofaunal. e. pelagic.

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How many planes divide the body of a biradially symmetric animal into two equal parts?

a. none b. 1 c. 2 d. 4 e. more than 4

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All of the following may have been in the atmosphere of primitive Earth EXCEPT 

A. hydrogen. B. ammonia. C. water. D. oxygen.

Biology & Microbiology