Which addictive substance became the most important item of export from North America?

Select the best answer from the choices provided.

A) Tobacco

B) Coffee

C) Opium

D) Tea

Does mold have cells

What gas is produced as a result of respiration

If a farmer plants the same crop every year, the soil becomes less fertile. What causes the loss of fertility?

There are 10 grams of fat 30 grams of carbohydrate and 4 grams of protein in the dessert. What percentage of calories comes from fat

Suppose that a species of toads is introduced into a new environment in an attempt to reduce the populations of insects. The toad has no natural predators in the new environment. The toad population would most likely A) Increase exponentially.

What is the position of heart valves when blood pressure is highest in the aorta?

The organelle within eukaryotic cells that contains genetic information is the

What is the major function of the valves found in human veins?

Lipids in a bilayer can diffuse laterally at a relatively fast rate, but / "flip-flop/" from one leaflet to the other very slowly without catalysis.

Which of the following groups contain organisms that have tissues and organ systems? A. prokaryotes. B. bacteria. C. eukaryotes. D. protists.