Which of the following is a compound?

A. Cl2

B. H2O

C. He

D. H2

Which of the following is true concerning energy flow through an ecosystem's food chain? a. Primary consumers collect their energy from the sun. b. The sun is the final receiver of energy in an ecosystem. c.

Both a toothbrush and a car are examples of technology. Explain why both are considered technology.

Each of the food groups in MyPlate provide all of the nutrients you need; therefore, eating from any one group will provide all your daily nutrients. A. True B. False

which of these technological advances has improved flu vaccines? A. virus strains multiplied in cell cultures B. sonograms C. antiviral drugs D. blood typing

How do organic compounds differ from inorganic compounds?

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