Best example of the sustainable use of a natural resource

The correct answer is option C, several governments agree to limit the amount of fish harvested from an ocean

Reason -

Sustainability is the process in which resources are utilized in an optimum way so that they don’t get extinct and thus they can be preserved for fulfilling the demands of next generation after the fulfillment of needs of the present generation. Here is this case, government aims at limiting fishing which will preserve the fish production  for future generation.

feral cats are estimated to eat tens of millions of native animals each night in australia

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.