Which of the following is a true statement about experimentation?
A) Variables in an experiment cannot be manipulated by the researcher.
B) Some hypotheses cannot be tested by experimentation.
C) Experimentation should test at least two or more hypotheses at the same time.
D) True randomization of subjects is impossible during experimentation.
B
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An example of mesoplankton would be
a. larval fishes. b. Sargassum seaweed. c. invertebrate larvae. d. green flagellates. e. bacteria.
Polygynous species:
a. are usually sexually monomorphic. b. are usually sexually dimorphic, with males larger and more highly ornamented. c. are more commonly found in birds than in mammals. d. usually employ external fertilization. e. are usually sexually dimorphic, with females larger and more highly ornamented.
A male's "primary" sex characteristics include _____
A) deepening of the voice at puberty B) development of the seminal vesicles and associated ducts C) elongation of the skeleton prior to puberty D) onset of growth of facial hair at puberty
Which of the following statements if NOT true?
a. Exotoxins are more lethal than endotoxins b. Endotoxins are part of the gram-positive cell wall c. Exotoxins can be neutralized in the blood by antitoxin treatment d. Endotoxins can cause septic shock