Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..
The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..
Upon fertilization, a zygote forms and develops into an embryo. This tutorial elaborates on the growth and development f..
Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..
Freshwater ecosystem is comprised of four major constituents, namely elements and compounds, plants, consumers, and deco..
This lesson is about the methods used for ecological research, such as quadrat and transect sampling, canopy fogging, an..