Pb has an atomic mass of 82. if an atom of that element has an atomic mass of 80, that atom is known as

a. magnetic. b. a stereoisomer. c. radioactive. d. an isotope.

D. an isotope.

Explanation:

Magnetic is a substance possessing an extraordinary power or ability to attract.

A Stereo isomer is each of one or more compounds which have the same molecular formula but have different three-dimensional orientations of their atoms in space.

Radioactive is a substance which is less stable and thus decomposes to a stable nuclei by releasing some radiations or particles like alpha, beta particles or gamma-radiations.

Isotopes are atoms of same element with same atomic number thus contain same number of protons but different mass number, thus contain different number of neutrons.

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.  

the answer is cell division : )