Pls pls pls help why do certain species become extinct after an environmental over other species?

Joe is breeding cockroaches in his dorm room. he finds that the average wing length in his population of cockroaches is 4 cm. he chooses the six cockroaches that have the largest wings; the average wing length among these selected cockroaches is 10 cm. joe interbreeds these selected cockroaches. from earlier studies, he knows that the narrow-sense heritability for wing length in his population of cockroaches is 0.6. a. calculate the selection differential and expected response to selection for wing length in these cockroaches. b. what should be the average wing length of the progeny of the selected cockroaches?

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Crystallization from cooling magma disvribe one way that a atoms bond b protons attract electronsc ions combine d minerals form