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

Biology & Microbiology

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Which of the following are bone-forming cells?

A. lacunae B. osteoblasts C. osteoclasts D. osteocytes

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

Which bone in the body does not articulate with any other bone?

A. coccyx B. temporal C. scapula D. hyoid E. maxilla

Biology & Microbiology