The brown tree snake was accidentally introduced to the island of guam during world war ii. since then, this snake has caused the extinction of twelve native bird species by eating their eggs and young. one negative result of this snake’s introduction was most likely
1. an increase in diversity as new species evolved to replace extinct species
2. an increase in mosquitoes due to an increase in bird species in the environment
3. a disruption of food chains and food webs in guam’s ecosystems
4. an abundance of brown tree snakes as a food source for humans

3. A disruption of food chains and food webs in Guam's ecosystems.

Explanation:

In the food chain, if one species goes extinct, other species go extinct too. If the bird species in that area goes extinct, animals that eat birds will probably go extinct or the number of surviving animals will drop. Things that the birds eat may thrive because nothing's there to eat them. This causes overpopulation.

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.