Lotic communities have conditions that are rather harsh for typical plants. Thus, the diversity of plant species in loti..
Viruses possess both living and non-living characteristics. This unique feature distinguishes them from other organisms...
Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..
Lentic or still water communities can vary greatly in appearance -- from a small temporary puddle to a large lake. The s..
The sea was teeming with life. Eventually, through reproduction and continued variation, fish came about. There are over..
The Earth's ecosphere was rapidly changing and throwing up a wide range of ecological niches that new adaptive organisms..