Biology is a natural science concerned with the study of living and live organisms including their structure, function, growth, evolution, distribution and taxonomy.
The main branches are:
Zoology: the study of animals and their structure.
Botany: the study of plants.
Microbiology: the study of microscopic organisms, and their effect on other organisms.
Biochemistry: the biological- chemical activities in the human body.
Molecular Biology: the study of molecular basis of the human body.