Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..
Animals adapt to their environment in aspects of anatomy, physiology, and behavior. This tutorial will help you understa..
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..
Stems primarily provide plants structural support. This tutorial includes lectures on the external form of a woody twig ..
Developmental biology is a biological science that is primarily concerned with how a living thing grows and attains matu..
