What is a gene? a section of a protein that codes for DNA
the alternate version of a trait
the visible trait in the F1 generation
a section of DNA that codes for a specific trait

A gene is an order of nucleotides in DNA or RNA that encodes the structure of a gene product, either RNA or protein. During gene expression, the DNA is copied into RNA. The RNA can be directly functional or be the standard template for a protein that performs a function.

Explanation:

Shout out to Wikipedia.

D. a section of DNA that codes for a specific trait

Explanation:

got it right in edg 2021

see pic

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.  

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.