Biology is the scientific study of life. It is a natural science with a broad scope but has several unifying themes that tie it together as a single, coherent field. For instance, all organisms are made up of cells that process hereditary information encoded in genes, which can be transmitted to future generations. Another major theme is evolution, which explains the unity and diversity of life. Energy processing is also important to life as it allows organisms to move, grow, and reproduce. Finally, all organisms are able to regulate their own internal environments.

जीवशास्त्रं यस्मिन् शास्त्रे विविधानां जीवानां समग्राध्ययनं विद्यते तच्छास्त्रं जीवशास्त्रं कथ्यते। समस्तप्राणिनां जीवनस्य सूक्ष्मरूपेण अवलोकनम् अध्ययनञ्च जीवशास्त्रस्य विषयः भवति।