Explain how the idea of artifical selection contributed to Darwin's ideas of natural selection

Darwin inferred that if humans could use artificial selection, perhaps inheritance could work the same way. ... Heritable differences that exist in every population are the basis for natural selection.

Explanation:

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.

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added