A terrestrial vertebrate that has scales and a three-chambered heart is a(n)
A) reptile.
B) amphibian.
C) mammal.
D) bird.
E) lobe-finned fish.
A
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Heavy metals are effective antimicrobial agents but are not widely used because of their high toxicity to humans.
Answer the following statement true (T) or false (F)
Which of the following is true of carbon?
A) It forms only polar molecules. B) It can form a maximum of three covalent bonds with other elements. C) It is highly electronegative. D) It can form both polar and nonpolar bonds.
Skeletal muscle contraction begins when calcium ions bind to _____
A) energized cross-bridges B) myosin C) actin D) acetylcholine receptors E) troponin
The first plant to colonize the plains of Mount Saint Helens after this volcano erupted in 1980 was a prairie lupine
The prairie lupine is therefore an example of ____.
a. a secondary successor b. a pioneer species c. a keystone species d. an exotic species e. an introduced species