Your heart works very hard when you run around a lot, pumping blood filled with oxygen and nutrients to the cells in your body. True
O False
Please answer fast

7th grade question (easy) look at the diagram of the food web. the arrows mean eaten by. what would happen if the number of snakes went down? answer choices are in the image.

Why do mutations in genes affect traits? o a. genes determine what type of mutagens an organism has. o b. genes produce proteins that cause traits. o c. genes affect how many chromosomes an organism has o d. genes code for carbohydrates that influence traits.

Fungi are classified into how many groups? a. 1 group b. 2 groups c. 3 groups d. 4 groups