The modern-day group of vertebrates that bridges the evolutionary gap between land-dwelling and water-dwelling organisms is
A) aquatic birds.
B) fish.
C) amphibians.
D) reptiles.
E) whales and dolphins.
C
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At high tide a coastal plant or animal cell will be in
Estuaries are locations where rivers flow into oceans, with tidal shifts changing the salt concentrations. Plants and animals that live in estuaries face a dilemma in maintaining water balance inside their cells. During high tide they are in salt water, while at low tide they are in fresh water. A. osmosis. B. an isotonic solution. C. a hypotonic solution. D. a hypertonic solution. E. equilibrium.
Which brain structure is the largest and most complex?
A. The hypothalamus B. The thalamus C. The cerebrum D. The cerebellum
What occurs to air currents as they travel from 60° north towards the pole?
A. The cool air will rise, producing a high pressure area with low rainfall. B. The cool air will rise and warm up, producing a low pressure area with high rainfall. C. The warmed air will rise and cool, producing a low pressure area with low rainfall. D. The warmed air will rise and cool, producing a low pressure area with high rainfall.
In performing a Gram's staining techniques, the counterstain is
A. Methylene blue B. Crystal violet C. Safranin D. Malachite green E. Gram's iodine