How does convection occur in the troposphere?

A. The Sun's rays heat Earth's surface.

B. Warm air rises and cool air sinks.

C. The Sun's electromagnetic waves reflect off clouds.

Lichens represent a symbiotic relationship between A. algae and fungi. B. fungi and rocks. C. animal-like protists and plant-like protists. D. euglena and nitrogen-fixing bacteria.

Nitrous oxide dilutes the air a person breathes, depriving the individual of oxygen. a. True b. False

Which is an organic molecule? a. hydrochloric acid (HCl) b. methane (CH4) c. water (H2O) d. carbon dioxide (CO2) e. oxygen (O2)

Which parts of the nitrogen cycle are involved in moving nitrogen from the atmosphere into the soil? a. 3 and 7 b. 1 and 4 c. 4 and 6 d. 6 and 7

A criminalist uses a fluorescent chemical called luminol and an ultraviolet light source to see a large bloodstain on a carpet. Which type of evidence is he detecting? A. latent evidence B. gross evidence C. direct evidence D. trace evidence

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

Describe what happens during the regeneration stage of the calvin cycle

Почему при нехватке кислорода человек может погибнуть? Кратко!