The ability of one or more organisms in a population to tolerate a chemical such as a pesticide or antibiotic designed to kill it and to reproduce more rapidly than the members of the population that do not have such genetic traits is called?

The correct answer is- Resistance

Explanation:

The ability of any organism in a population to tolerate a chemical like insecticide, pesticide or antibiotic which is designed to kill it or slow its reproduction is called resistance.

For example, the antibiotic resistance is seen in some bacteria like MRSA(Methicillin-resistant staphylococcus aureus). They gain this resistance because they have some variant traits in their genome which provide them resistance against these chemicals.  

These individual are selected through natural selection when the environmental condition changes and become adverse. So the correct answer is resistance.

i think the answer is gold im not entirely sure