Biology

Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, origin, evolution, distribution, and taxonomy. Biology is a vast subject containing many subdivisions, topics, and disciplines. Among the most important topics are five unifying principles that can be said to be the fundamental axioms of modern biology:

•     Cells are the basic unit of life
•     New species and inherited traits are the product of evolution
•     Genes are the basic unit of heredity
•     An organism regulates its internal environment to maintain a stable and constant condition
•     Living organisms consume and transform energy.

Subdisciplines of biology are recognized on the basis of the scale at which organisms are studied and the methods used to study them: biochemistry examines the rudimentary chemistry of life; molecular biology studies the complex interactions of systems of biological molecules; cellular biology examines the basic building block of all life, the cell; physiology examines the physical and chemical functions of the tissues, organs, and organ systems of an organism; and ecology examines how various organisms interact and associate with their environment.


Here are some of the links you can refer and study Biology in deep : 

• Cell biology    
• Botany 
• Biophysics    
• Bioinformatics
• Astrobiology
•  Anatomy