This image represents: A. the loss of energy that occurs between trophic levels in an environment.
B. how larger producers create larger amounts of energy.
C. the interactions between oxygen and nitrogen in a habitat.
D. None of these choices are correct.

Aregion of space in which a measurable gravitational force is indicated by the force exerted on a test mass is called

Choose a synonym for the underlined homonym (a word with two or more meanings). i did not expect the boat to rock so much. a. boulder c. astound b. sway d. shock

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?