Well Selective breeding is where animals will mate with others who has Positive traits that they'd like there young/ken to have. We tare down trees which kills animals and also we kill animals for food or whatever which decreases the population. If i didn't completely answer the question just say and ill respond quickly to help!
Answer:
Yes, Bubbles can be a sphere, ellipsoid or a hemisphere.
They help neutralize the acids produced by the stomach.
I'm 100% that the answer is D, thermal conductivity.
It was either C or D but D makes more sense than C does
so your answer is D