Please help!! ^^ Which of the following is NOT an environmental impact of mining?
A) Creates acid drainage that pollutes groundwater.
B) Causes erosion.
C) Destroys natural communities over large areas.
D) Creates minimal dust.

Which of the following are false concerning microbes? a. microbes generate oxygen through photosynthesis.b. the primary role of microbes on the planet involves causing disease in animals and humans.c. microbes produce vitamins in the intestines.d. microbes play a role in breaking down waste and decomposing dead organisms.

The two tubes contain bromothymol blue. after 24 hours, what will the color of the water be in tube b? a. green (it won't change) b. yellow c. blue d. colorless (clear)

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.