In the late 1980s, however, unusually warm weather caused many of the pools that the toads used as breeding areas to dry up. by 2004, the golden toad was listed as extinct. this example demonstrates how a. extinction can be related to invasion by non-native species competing for resources. b. extinction can be related to a failure to adapt to changes in the environment. c. extinction is caused by bacteria, fungi, and other infectious agents. d. extinction is directly related to human impact.

Option B, extinction can be related to a failure to adapt to changes in the environment.

Explanation:

Here,

The toads species became extinct as the pools used by them for breeding dried up. If these toad would have adapted themselves to mate even in dry condition or without water they would have survived.

Drying up of pool is a natural event resulting into change in native environment.

Option A is not correct  as in this scenario as there were no native species other than the toads which were consuming the resource

Also option C, is not correct as in this scenario the extinction was not related to infection caused by any microorganism like bacteria etc.

Option D is also incorrect as there was no involvement of humans,  which had  led to the drying up of pool.

Thus, only option B is a possible answer to this question

straight or amphibians are homeothermic to thermal

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.