When a person is exercising, the body needs to deliver increased amounts of oxygen to the muscle. which component of blood ensure that the muscles will receive it?

Write a paragraph explaining why the effect of mutations can vary widely - from neutral to harmful to beneficial

Why might surface mining be less risky for miners than underground mining? a. surface miners can become trapped in a collapsed mine. b. surface miners work in dusty, enclosed areas. c. surface miners work aboveground. d. surface miners use elevators to enter mines.

What is one way intensive agriculture can contribute to climate change? a. tree loss to agriculture increases earth's albedo b. livestock manure absorbs greenhouse gases c. large herds of livestock release greenhouse gases d. fewer trees are available to replenish petroleum stores appex