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

Biology & Microbiology

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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.

Biology & Microbiology

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?

Biology & Microbiology

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

Biology & Microbiology

Humans are chordates. Which animal group is most closely related to chordates?

A) molluscs B) echinoderms C) annelids D) arthropods

Biology & Microbiology