Speciation often occurs when a habitat becomes more heterogeneous. In Lake Victoria different species of cichlids are found in different areas of the lake. The best explanation for this speciation is that
A) natural selection favored different heritable variations in different parts of the lake.
B) male cichlids that lived in deep water needed to be seen by females, so they became colorful.
C) food was scarce in the lake, so some fish had to learn how to scrape algae, some had to learn to eat insects, and some had to learn to bite leaves.
D) humans selected for many different traits in cichlids in order to market them to the aquarium trade.
Answer: A
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Soil particles are classified on the basis of
A) age. B) color. C) water content. D) size.
A gland located in the dermis of the skin that helps to regulate body temperature is the ________ gland, which is a type of ________ gland
Fill in the blank(s) with correct word
The classification of prokaryotes in Bergey's Manual of Systematic Bacteriology is largely based on
A. Gram stain reaction. B. habitat. C. type of electron receptor used in cellular respiration. D. rRNA sequences. E. cellular morphology.