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
Biology & Microbiology
The person who first used the term cell was
a. Darwin. b. Leeuwenhoek. c. Hooke. d. Watson.
Biology & Microbiology
Calcium carbonate shells and thread-like pseudopods are characteristic of
A) euglenids. B) alveolates. C) foraminiferans. D) excavates. E) radiolarians.
Biology & Microbiology
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