Describe the overall trend in corn yield from 1988 to 2008. How does the trend in corn yield during that time compare to trends for total nutrients and nitrogen?

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

When a person is exercising the body needs to deliver increased amounts of oxygen to the muscles which component of blood ensures that the muscles will receive it

Which statement is true for bacteria a. bacteria have complex internal structures b. all bacteria are spiral in shape c. all bacteria cause disease in animals d. bacteria break down some foods