Which of the following is an example of an echinoderm?
a. Frog
b. Sand dollar
c. Ant
d. Crab
e. Centipede
Ans: b. Sand dollar
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Which of the following are bone-forming cells?
A. lacunae B. osteoblasts C. osteoclasts D. osteocytes
In humans the pharyngeal slits mostly disappear during development, except for one pair that in the adults forms:
A. a cleft palate B. the Eustachian tubes C. the thyroid gland D. the glottis E. the opening to the voice box
In streams flowing through dense forest, ____; therefore nutrients from organic detritus is particularly important
a. dissolved oxygen levels are high b. dissolved oxygen are low c. the water moves slowly d. dense vegetation blocks light necessary for photosynthesis e. photosynthetic organisms make up most of the life in these streams
Which bone in the body does not articulate with any other bone?
A. coccyx B. temporal C. scapula D. hyoid E. maxilla