Evolution has been tested in various ways
Genetic, fossil, anatomical, physiological and
behavioral studies all confirm that evolution is
the mechanism of the origin of species. Thus,
in science evolution is considered a scientific
a. fact
b. hypothesis
c. law
d. theory
e. guess
D
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What best summarizes the oocyte's contribution to the zygote? a. The oocyte contributes paternal DNA
b. Numerous substances are contributed by the oocyte, including maternal DNA, enzymes, yolk, and proteins. c. Nothing; an oocyte forms after several cleavages of the zygote. d. Oocytes are the source of the enzymes used by the sperm to penetrate the egg's membrane.
Humans have disrupted the nitrogen cycle primarily by
a. irrigation. b. cutting down forests. c. using nitrogen-containing fertilizers. d. crop rotation. e. leaching.
Both mitochondria and chloroplasts are
thought to have evolved by the process of
a. endosymbiosis. b. sexual selection. c. allopatric speciation. d. sympatric speciation. e. more than one of these.
A __________ (fungus-root) is a symbiotic interaction between a fungus and a plant. Fill in the blank(s) with the appropriate word(s)