At the bottom of an energy pyramid are the ____
a. primary producers
b. secondary producers
c. primary consumers
d. secondary consumers
e. tertiary consumers
ANSWER: a
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The area beyond the neritic zone is called
a. abyssal plain. b. ocean basin. c. trench. d. continental margin. e. the hadal zone.
Compared to humoral immunity, cell-mediated immunity is more likely to defend against which of the following?
A) virally infected cells only B) transplanted tissue only C) cancer cells only D) both virally-infected cells and cancer cells E) virally-infected cells, cancer cells, and transplanted tissue
In seed plants, which structure contains the male gametophyte?
a) ovule b) pollen c) seed d) ovary
Organisms such as lizards that need to maintain body temperature through external means do so by
A. running frequently to warm up. B. sunbathing. C. swimming in geothermal pools. D. eating large meals to provide calories for heat production. E. shivering to produce heat.