What type of skeleton do earthworms have?
a. exoskeleton
b. endoskeleton
c. hydrostatic skeleton
d. segmental skeleton
e. none of these
C
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What will be an ideal response?
Which of the following statements concerning phospholipids is FALSE?
a. They have two distinct regions, one strongly hydrophobic and the other strongly hydrophilic. b. They are amphipathic molecules. c. They have cylindrical shapes that allow them to associate with water most easily as a bilayer structure. d. They contain a polar organic group attached to a phosphate group. e. They contain three fatty acids chains.
Movement of body parts directly requires the
a. endocrine system and nervous system. b. muscular system and skeletal system. c. skeletal system and digestive system. d. muscular system and cardiovascular system. e. nervous system and endocrine system.
What are the tympanum and stapes in tetrapods used for?
a. smelling b. heat sensing c. tasting d. hearing