Which type of speciation occurs when there is a shift in the chromosomal number?

a. Allopatric
b. Gene flow
c. Stabilizing selection
d. Sexual selection
e. Sympatric


e

Biology & Microbiology

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The organisms believed to be the first to use two different photosystems in a single photosynthetic electron-transport chain are the:

A. yeast. B. archaea. C. cyanobacteria. D. algae. E. green plants.

Biology & Microbiology

The sensory nerves of the somatic portion of the peripheral nervous system:a

transmit information from internal receptors to the central nervous system. b. transmit information from sensory organs to the central nervous system. c. transmit information from the central nervous system to glands. d. transmit information from the central nervous system to skeletal muscles. e. regulate cardiac activity. What will be an ideal response?

Biology & Microbiology

Gingko trees are known to lose their leaves at a certain time each year throughout the United States. Based on this information, Gingko trees in China must behave the same way. These statements are an example of

A. a theory. B. deductive reasoning. C. an experiment. D. inductive reasoning.

Biology & Microbiology

Resident biota (normal flora) of human beings include members of the

A) bacteria. B) arthropods. C) fungi. D) all of the above.

Biology & Microbiology