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

Biology & Microbiology

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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)

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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.

Biology & Microbiology

Skeletal muscle contraction begins when calcium ions bind to _____

A) energized cross-bridges B) myosin C) actin D) acetylcholine receptors E) troponin

Biology & Microbiology

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

Biology & Microbiology