Skeletons of early vertebrates were composed of cartilage instead of bone. Which characteristic does cartilage share with notochords?

A. It is hard and rigid.

B. It is soft and flexible.

C. It contracts.

D. Oxygen can diffuse through it.

A driver comes upon an accident. He jumps out of the car, runs over, and pulls out an injured passenger. He feels full of energy. What part of the driver's nervous system is responsible for this? A. Somatic B. Sympathetic C. Limbic D.

What make the phosphorus cycle different from carbon cycle

Scientific experiments often produce new scientific knowledge. What usually happens if a scientific experiment generates new knowledge that doesn't agree with an existing theory? A. Scientists choose whichever side seems to have the most followers.

If a physician tells you that Staphylococcus aureus can cause an asymptomatic infection, what effect will that infection have on a patient?

Which statements regarding hypotheses are true? Check all that apply Hypotheses are based on observations.

8. Agent that kills microorganisms, rather than inhibits it:

What nutrients are required in higher amounts during pregnancy due to their roles in the synthesis of red blood cells?

Why are freshwater ecosystems such important resources? Mark all that apply

Which polymers carry the information for cell growth and reproduction from one generation to the next

State the property that allows water molecules to be drawn up through the filter paper.