All living things contain what components?

A.

oxygen, hydrogen, and carbon

B.

helium, nitrogen, and iron

C.

proteins, fats, and carbohydrates

D.

oxygen, carbon dioxide, and carbon monoxide

E.

water, hydrogen, and sodium

The primary source of energy for producers in an ecosystem is

Characid fishes are found naturally only in South America and Africa. Fossils of these fish are not found on any other continents.

Which term defines a star system with two stars? binary star system eclipse star system open cluster star system globular cluster star system

About 53% of all deaths in the u. s. are caused by cardiovascular disease and:

Which two statements are true? A.) The definitions for electric force and electromagnetic force are identical. B.) Electric forces and magnetic forces are different aspects of a single electromagnetic force. C.

What does a scale measure

Why is it not necessary to include a negative control for this stain procedure?

In which type of environment did this fossilized fish most likely live?

5. What is pretexting? How is this used?

The energy usage per capita in Africa and Asia have grown tremendously the last 50 years. Which of these would be a good explanation of why the energy use off these continents has grown more quickly over this time period when compared to North