Humans are able to distinguish several million shades of color because
A. humans have large retinas.
B. different proportions of cone cells respond to each wavelength of light.
C. they have many different types of cone cells.
D. humans have more cones than rods.
E. humans have binocular vision.
Answer: B
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Sex _________ (estrogen, testosterone) stimulate osteoblasts and promote the growth of long bones, especially in adolescence.
Fill in the blank(s) with the appropriate word(s).
The white muscles of fish are organized into units of parallel layers derived from internal segments of the embryo called __________
Fill in the blank with the correct word.
The ________ muscle forms the widest part of the back and appears on the lateral surface of the lower thoracic and upper abdominal regions.
Fill in the blank(s) with the appropriate word(s).
Red blood cells contain the enzyme _____, which catalyzes the formation of carbonic acid.
A. carbonic anhydrase B. carbon dioxide acidase C. oxidase D. catalase