Mammals are a diverse group of organisms, where most of them develop their offspring within the uterus of the mother. Ov..
The sea was teeming with life. Eventually, through reproduction and continued variation, fish came about. There are over..
Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..
Darwin's Finches are an example of natural selection in action. They are an excellent example of the way species' gene p..
This lesson is about the methods used for ecological research, such as quadrat and transect sampling, canopy fogging, an..
The kidneys are responsible for the regulation of water and inorganic ions. Read this tutorial to learn about the differ..