At mid-ocean ridges,

A. the crust is older.

B. sea-floor spreading occurs.

C oceanic lithosphere is destroyed.

D. tectonic plates are colliding

Pollutants that interfere with the normal function of hormones are called:

The main functions of nucleic acids are to what?

A healthy environment depends on biiogeochemical cycles maintaining a balance of input and output. Deforestation and the burning of fossil fuels from industry are increasing the amount of carbon dioxide in the atmosphere.

Which of the following describes a difference between mitosis and meiosis?

VOC's were introduced in "What Causes Air Pollution", the abbreviation for VOC is ... a. Very Organic Chemicals. b. Volatile Organic Chemicals c. Volatile Organic Compounds d. Very Organic Compounds

There are twenty standard amino acids that make up all proteins. What four elements are found in all amino acids?

What organism is closely related to the cougar?

Factors contributing to the likelihood of contracting HIV infection include: A. Number and frequency of sexual contact B. Intravenous drug use C. Sexual partner of people with HIV/AIDS D. People with other sexually transmitted diseases E.

A scatter plot is useful in visualizing trends over time. a. True b. False

Why the lungs are considered part of the excretory system?