During which era did the dinoflagellates, coccolithophorids, and diatoms appear?
A. Paleozoic Era
B. Mesozoic Era
C. Cenozoic Era
D. Neoproterozoic Era
E. Paleoproterozoic Era
B
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Plants open their stomata to obtain
a. carbon dioxide from air. b. oxygen from air. c. sugar from the roots. d. water from air
Pepsin is an enzyme that functions in the stomach. Its optimum pH would be ____
a. between 1 and 2 b. between 3 and 4 c. above 6 d. between 5 and 7.5 e. above 8.5
Two members of the same species compete for a limited resource, resulting in equal sharing of the limited resource
What is this called? a. interspecific scramble competition b. intraspecific scramble competition c. interspecific contest competition d. intraspecific contest competition e. density-independent competition
How has human activity added to eutrophication of freshwater lakes?
What will be an ideal response?