9. If subjected to sound frequencies of
25,000 to 100,000 cycles per second,
which of the following would be least
affected?
(1) a porpoise
(2) a house cat
(3) a cheetah
(4) a bat
(5) a human being

What evidence is there that convection occurs in earth’s troposphere?

Which of the following is the best definition for the process of photosynthesis? a.) plants digest sugars to make energy. b.) plants use oxygen and glucose to make carbon dioxide. c.) plants use sunlight and carbon dioxide to make sugars. d.) plants use sunlight to make chlorophyll and chloroplasts.

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome