Myelinated axons make up the _________ of the brain
A. brain stem
B. white matter
C. sulci
D. gray matter
B
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A testcross is performed to determine if a specific individual is a carrier. The results generate a 50/50 ratio of phenotypes. The test subject is therefore ________.
A. homozygous recessive B. heterozygous C. heterozygous dominant D. homozygous dominant
The skeletal elements that give support to a sponge's body are called
a. choanocytes. b. spongin. c. spicules. d. collar cells. e. porocytes.
The advantage of bipedalism is
A. having the ability to move through the treetops and clinging to vines. B. increased brain size. C. freeing of hands to carry objects and use tools. D. All of the answer choices are correct. E. having the ability to run faster.
__________ are electrically excitable cells that signal other cells by means of chemical messages. Fill in the blank(s) with the appropriate word(s)