Most shellfish are

a. producers

b. scavengers

c. autotrophs

In the nitrogen cycle, the bacteria that replenish the atmosphere with N2 are

The structure of adenosine triphosphate (ATP) is shown here. Which statement best explains how energy stored in the chemical bonds of ATP can be released. A) Adenine is removed by hydrolysis from an ATP molecule.

Why are invasive species dangerous to the environment? They pollute the environment. They are always predators. They threaten biodiversity. They bring abiotic factors.

S-waves arrive at a seismic station? First Second Third Fourth

Which cell is the body's primary defense against parasitic invasion?

If I turn my computer off at least once a week, it will run faster. What is the independent variable? What is the dependent variable? What are some controlled variables?

Which process is a "build up" process

Volcanoes, lightning, and the combustion of fossil fuels ALL contribute to acid precipitation. true false

Does an electric current cause a coiled wire to become an electric bell

Which is a renewable resource? A) coal B) sunshine C) gasoline D) natural gas