A biome is
a large geographical area of distinctive plant and
animal groups, which are adapted to that particular
environment. The climate and geography of a region
determines what type of biome can exist in that
region. Major biomes include deserts, forests,
grasslands, tundra, and several types of aquatic
environments. Each biome consists of many
ecosystems whose communities have adapted to the
small differences in climate and the environment
inside the biome.
All living
things are closely related to their environment.
Any change in one part of an environment, like an
increase or decrease of a species of animal or
plant, causes a ripple effect of change in through
other parts of the environment.
The earth
includes a huge variety of living things, from
complex plants and animals to very simple,
one-celled organisms. But large or small, simple or
complex, no organism lives alone. Each depends in
some way on other living and nonliving things in
its surroundings.