The membrane of a resting neuron is most permeable to which of the following ions?
A. Cl-
B. K+
C. H+
D. Ca2+
E. Na+
Answer: B
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Chemical messengers produced by endocrine glands are called
a. agonists b. neurotransmitters c. hormones d. enzymes
A rain shadow is a reduction in rainfall _____
a. on the inland side of a coastal mountain range b. during an El Nino event c. that results from global warming
The geologic time scale is subdivided on the basis of
a. the appearance of different radioactive isotopes in different strata. b. levels of background extinction. c. periods of mass extinction. d. the appearance of different radioactive isotopes in different strata and levels of background extinction. e. the appearance of different radioactive isotopes in different strata, levels of background extinction, and periods of mass extinction.
The saguaro is a giant cactus that is found in desert regions of Arizona. This is information about the cacti's ________
A) habitat B) niche C) biosphere D) succession