Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..
The gastrointestinal system breaks down particles of ingested food into molecular forms by enzymes through digestion and..
Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..
Meiosis is a form of cell division that creates gametes. It is comprised of two divisions that in the end, the resulting..
Nutrients in the soil are essential to the proper growth of a land plant. This tutorial deals with the properties of soi..
With regard to the population size of a species and what factors may affect them, two factors have been defined. They ar..