Major trends in the evolution of animals
include
a. cephalization, the development of a definite
head region.
b. the development of types of symmetry.
c. variation in coelomic cavities.
d. segmentation.
e. all of these
E
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What will be an ideal response?
The basic unit of the nervous system is the
a. neuron. b. neuroglial cell. c. brain. d. nerve. e. neurotransmitter.
Which of the following is a common ailment characterized by a burning sensation caused by gastric juices backing up into the esophagus?
A) heartburn B) acidosis C) porosis D) gastritic stress
Which is another name for bone cells that remain alive even after the extracellular matrix becomes hardened with calcium phosphate crystals?
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