What affects the abundance of meiofauna during seasonal variations?
a. Temperature
b. Wave action
c. Predators
d. Size of sediment
b
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The major obstacle to the use of xenotransplants is ________________
A. not enough human donors B. finding the right sized animals C. resistance from opponents of genetically modified animals D. organ rejection by recipients E. more than one of these
By definition, the onset of bleeding defines day __ of the menstrual cycle.
Fill in the blank(s) with the appropriate word(s).
The exchange of gases between an organism and its environment is known as:
a. exhalation. b. aeration. c. inhalation. d. respiration. e. ventilation
Of the following conditions, which is absolutely necessary for diffusion to take place?
A) a differentially permeable membrane B) a true solution C) a concentration difference D) a non-permeable membrane E) a living cell