Members of a bird-watching club observed the activities of three species of birds for an entire spring and summer. They noticed that the different species fed at different heights in the same pine tree. Which ecological concept is supported by this observation?
(1)Organisms that feed on different foods in the same area of an ecosystem fill the same niche.
(2)Organisms that live in the same ecosystem can occupy different niches in the ecosystem.
(3)Different species feeding in the same ecosystem will eventually compete with each other, eliminating all the species except one.
(4)Different species living in the same area of an ecosystem usually have the same physical characteristics.