Answer:
Habitat" is where something lives. "Niche" implies a more transactional analysis of its energy and informational interactions there. "Niche" is used both in the ecological and the cell biological literature (e.g. the niche for stem cells in the adult mammalian brain). For example: A fox's habitat may be a certain kind of forest. It's niche there might involve eating rodents, digging out a den in soft earth among the roots of tall trees, and blending in with the surroundings. "Elements" of the "niche" might be found elsewhere allowing the fox to live in a different "habitat"..
By : David Thaler