Nitrogen makes up 78% of Earth’s atmosphere. Which statement best describes an important function of the nitrogen cycle? A. Animals breathe in nitrogen gas and their cells use it. B. Bacteria convert nitrogen gas into molecules that plants use. C. Plants use nitrogen gas to make energy during photosynthesis. D. Nitrogen gas combines with oxygen to form water that supports all life.

Organelles are 1. responsible for producing power for the cell 2. tiny structures in the cell that carry out the cell's activities 3. responsible for digestion in the cell 4. found outside of the membrane

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.

Of is j/kg·k. if a 2.6 kg of isk to k,is ?