Bones are held together at joints by
a. tendons.
b. intercellular junctions.
c. ligaments.
d. cartilage.
e. collagen.
Answer: c
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An enzyme may lose its ability to function because of
(a) excessively high temperatures. (b) a change in its three-dimensional structure. (c) a large change in the pH of the environment. (d) all of the above.
Which of the following best describes cnidarians?
A. They have radial body symmetry, tissues, and stinging cells. B. They are asymmetrical and have tissues and stinging cells. C. They have radial body symmetry, lack tissues, but have stinging cells. D. They have radial body symmetry and tissues but lack stinging cells.
Sharks differ from most other fish in that they lack ____.
A. gill slits B. scales C. bone D. paired appendages E. teeth
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What will be an ideal response?