What valve prevents blood from returning to the right ventricle?

What is the greatest magnification normally provided by a light microscope? 100x 1,000,000x 1,000x 500x

Atoms are the smallest part of matter, but does is contain any protons or electrons?

Which organism would you expect to find at a level C

Which of the following is defined as the movement of individuals to and from a population? Composition Distribution Dynamics Migration

When farmers plant the same crop in a field year after year, they are practicing?

Bones, joints, ligaments, and cartilage are parts of the a) refrigerator b) muscles c) skeleton

Chloroplasts cannot move on their own. How do they move around the cell?

What causes leaves to dry out

And increase in food and a decrease in predators would most likely

Which would provide the body with the most energy? a. Carrying oxygen from the lungs to the cells b. Breaking the bonds in a disaccharide c. Breaking a single carbon bond d. Creating bonds to make a simple sugar