What is the function of heart valves

A) they prevent blood from flowing backwards

B) they force blood to flow out of the heart

C) they return blood to the heart

D) they regulate the heart rhythm

What type of macromolecule does the nucleus hold?

Gould and Eldredge proposed this new theory called

Which of the following statements violates the cell theory? A) Mitosis produces new cells identical to the parent cell that divided to make them. B) Viruses are not considered to be living organisms, because they are smaller than a cell.

Which scientist introduce the concept of deep time

Why did Gregor Mendel use peas in his experiments

The future of biology in 100 years

Can identical twins be different heights

What are the 3 primary elements that cycle between the mitochondria and chloroplasts

Which characteristic do sponges display when they feed on particles filtered from water? heterotrophy diffusion osmoregulation

Waste products which build up in the body can become deadly. True or False