The conversion of nitrates into nitrogen gas which is then released into the atmosphere. This is caused by bacteria and how they obtain their energy. A small amount is converted to usable forms by lightning in a process called atmospheric nitrogen fixation...
The Earth's ecosphere was rapidly changing and throwing up a wide range of ecological niches that new adaptive organisms..
This tutorial investigates perception as two people can interpret the same thing differently. Know more about human perc..
The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..
This tutorial looks at the relationship between organisms. It also explores how energy is passed on in the food chain an..
Different pregnancy and birth control and contraception strategies are described. Read this tutorial to learn each of th..
Homeostasis is essential to maintain conditions within the tolerable limits. Otherwise, the body will fail to function p..
