External fertilization of eggs in animals is:
A) most common among hermaphroditic species.
B) less common in cnidarians.
C) rarely seen except in aquatic environments.
D) most common in arthropods.
E) absent in vertebrate species.
Answer: C
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A. acoelomates. B. pseudocoelomates. C. triploblastic. D. coelomates. E. diploblastic.
The tiny projections of hair-like cells located on the villi are called ________. a. flagella b. brush border cells c. None of these choices
d. cilia e. microvilli
In vertebrates, mechanoreceptors are not found in which of the following:
1.skin 2.skeletal muscles 3.walls of blood vessels 4.internal organs 5.all of these structures have mechanoreceptors
What are two organ systems that are not always found in animals?
What will be an ideal response?