What is the change in the internal energy of a system that does 5,000 joules of work and absorbs 20,000 joules of heat?

In what for do plants utilize nitrogen? why do they need nitrogen?

The fish shown above is a tarpon. it is a fast-swimming and powerful open-water fish. its closest relatives, oddly, are burrow-dwelling conger eels that stay on the bottom. both eels and tarpon developed from snake-like larvae that float in the plankton during the first stages of life. once they mature, tarpon and eels are not found near one another in the ocean. the tarpon and the eel illustrate all of the following except

Which feature of a human community is similar to a niche in a biological community