The evolution of the species of the genus "Homo" led to the emergence of modern humans. Find out more about human evolut..
Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..
It only takes one biological cell to create an organism. A single cell is able to keep itself functional through its 'mi..
The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides ..
A running water environment offers numerous microhabitats for many types of animals. Similar to plants, animals in lotic..
Plants protect themselves by releasing hydrogen peroxide to fight against fungal invasion. Another way is by secreting c..
