True or false? If you did not control variables in a experiment, there would be no way to know which variable explained your results.

Which reaction is exothermic? a reaction that absorbs energy from the environment a reaction that requires an activation energy a reaction that releases energy into the environment a reaction that does not involve a change in energy

Plants require less water in times of active growth t or f

You look into a microscope and view an unknown cell. What might you see that would tell you whether the cell is prokaryotic or eukaryotic?

What is upwelling? A. The mixing of two biomes B. The productivity of an ecosystem C. When infertile species reproduce O D. Water moving up from the benthie zone

Why do you think there are fewer heart transplants performed each year than kidney transplants?

Which of the following statements is NOT consistent with evolution by natural selection? a. Natural selection can lead to speciation. b.

How does the extra dopamine released during drug use affect the brain?

No fossils of Homo neanderthalensis have been found in Africa, but many African populations have traces of Neanderthal DNA.

What is heart what is the job of the herat

Select the correct answer from each drop down menu. Arteries usually carry oxygenated blood away from the heart. However, the pulmonary artery carries deoxygenated blood.