John had $20. He earned $5, spent $10, earned $5 again, and then spent $3. After this series of earnings and expenses, how much money did he owe or have left? $

Trace a drop of blood from the left atrium to the left hallux and back to the right atrium

Define: arteriosclerosis

Which layer of the atmosphere causes weather

Which compound is a metabolic intermediate of the light-independent reactions in photosynthesis?

What three factors contribute to the layering effect that occurs in the world's oceans? I know one of them is salinity

Earth's tectonic plates A. move in similar ways today as they did in the past. B. can move up and down but not sideways. C. didn't start moving until the 21st Century. D. moved only during Earth's earliest period of history.

Why is taking vitamin c ineffective at enhancing iron absorption from standard iron supplements?

5. If the pressure exerted on a gas in a flexible container is increased does the density of the gas change? Why or why not? Explain your answer

What is the role of cellular reproduction in maintaining genetic continuity

What is the trait that distinguishes primates, rodents / rabbits, crocodiles, and dinosaurs / birds from amphibians and earlier lineages?