Where in the brain is the corpus callosum?
a. between the cerebellum and the medulla oblongata
b. below the cerebellum
c. between the two hemispheres of the cerebrum
d. between the pons and the midbrain
e. between the thalamus and the hypothalamus
ANSWER: c
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Which statement is not true about conifers?
(a) Conifers are gymnosperms. (b) All conifers belong to the genus Pinus. (c) All conifers have naked seeds. (d) Conifers are heterosporous.
Which of the following statements about the loop of Henle is correct?
A. The thick segment of the ascending limb is impermeable to water. B. The descending limb actively transports electrolytes into the interstitial fluid. C. Water moves from the interstitial fluid into the descending limb of the loop of Henle. D. The filtrate is more concentrated when it leaves the loop of Henle than when it enters the loop. E. All of these answer options are correct.
You have just invented a time machine and you want to investigate the past (the dream of every paleontologist!). When is the earliest time in Earth history that you could go back and not have to have an oxygen tank so that you could breathe normally?
A. Cambrian Period B. Phanerozoic Eon C. Archaean Eon D. Quaternary Period E. Devonian Period
Geographically, where is net primary productivity the highest?
a. at the north pole
b. at the south pole c. between 30o and 60o d. in the Northern hemisphere e. at the equator