The pupil is an opening at the center of the:

a. retina
b. sclera
c. choroid
d. cornea
e. iris


e

Biology & Microbiology

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When did life first appear on the planet?

A. 2.1 billion years ago B. 3.5 billion years ago C. 2.1 million years ago D. 3.5 million years ago

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The person who first used the term cell was

a. Darwin. b. Leeuwenhoek. c. Hooke. d. Watson.

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Calcium carbonate shells and thread-like pseudopods are characteristic of

A) euglenids. B) alveolates. C) foraminiferans. D) excavates. E) radiolarians.

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Each human kidney contains about a million ________, which are the tubular functional units of the kidney.

A. renal medullae B. flame cells C. nephrons D. nephridia E. ureters

Biology & Microbiology