Organisms employ different strategies to boost its defenses against antigens. Humans have an immune system to combat pat..
The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..
The sequence of amino acids determines the type of protein. Protein is synthesized according to the sequence of nucleoti..
Certain species are capable of expressing characteristics indicative of the state of the ecosystem they occupy. They are..
This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..
A still body of water may be disturbed by a variety of factors. One of them is wind. In fact, it is considered as the pr..
