In the case of the cichlid fish in Lake Victoria, ____ was the driving force of speciation
a. artificial selection
b. fixed alleles
c. inbreeding
d. sexual selection
e. genetic drift
ANSWER: d
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The most recent common ancestor of animals and fungi was a multicellular aquatic organism
Indicate whether the statement is true or false.
Evolution _____________. (Mark true (t) or false (f) for each statement.)
____ is a change in allele or genotype frequency over time ____ always results in a visible change in the physical characteristics of an organism ____ is a process that takes many, many generations ____ is only seen in unicellular organisms ____ is a natural phenomenon that is outside the influence of humans ____ can only occur in the natural environment ____ is not seen in domesticated animals ____ always results in an increase in an organism's fitness ____ is inherently random in nature ____ acts on animals but not plants What will be an ideal response?
Four of the five answers listed below are related by a similar gland. Select the exception
a. goiter b. deficiency of iodine in the diet c. hypothyroidism d. rickets e. excessive stimulation of the thyroid gland
Humans are chordates. Which animal group is most closely related to chordates?
A) molluscs B) echinoderms C) annelids D) arthropods