Plants and animals live on all parts of the earth. Each organism
lives where conditions are the most suitable for its own
specific needs. Organisms within an area interact with one
another and also with their environment.  Interactions among
organisms strongly influence the behavior and ecology of
organisms. The interactions are defined as whether they are
beneficial, harmful or neutral.  Mutualistic relationships are
interactions which invokes both plant and animal are benefiting.
Mutualism is very common in pollination. Antagonistic
interactions are usually harmful    Life on the earth is limited
to a very narrow zone called the biosphere. Organisms live
within the biosphere. The part of the biosphere that surrounds
an organism is called its environment.Organisms interact and
form complete relationships within an environment. The study of
the interactions between organisms and their environments is
called ecology. Living organisms interacting with each other and
their nonliving environment make up an ecosys