Eggs and sperm are
a. gametes
b. spores
c. gametophyts
d. sporophytes

Eggs and sperm are examples of GAMETES.

Explanation: By definition a GAMETE is

mature haploid male or female germ cell which is able to unite with another of the opposite sex in sexual reproduction to form a zygote.

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.