Biology is the study of
. The word
refers to any living thing. To be considered alive, an object must exhibit all of the
of living things
There are
such characteristics. These are: nutrition, respiration, excretion, growth, reproduction, movement and
. A
thing may exhibit some of these characteristics. A car may move but it does not
or reproduce. The two main groups of living things are
and animals. Plants usually have leaves, roots and a
. Animals may be classified as vertebrates and
. Vertebrates have a
. A frog is an example of a vertebrate. To identify living things we make use of a
. This helps us identify various
of plant and animal.