Which of the following is an inference? a. mrs. thompson asked the students turn in their papers before beginning their presentations. b. melanie cleared her throat before the presentation because she was nervous. c. bobby gave his classroom presentation on the bill of rights. d. sarah said she made an outline to her memorize her presentation.

This is an active transport mechanism by which cells pump sodium and potassium ions against the concentration gradient

Which spheres are involved when sedimentary rocks formed from parts of seashells at the bottom of the ocean? a.) biosphere, atmosphere, geosphereb.) geosphere, hydrosphere, biosphere c.) geosphere, exosphere, hydrosphered.) hydrosphere, biosphere, atmosphere

Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c.carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit