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Origins of Life on Earth
Origins of Life on Earth

Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..

Freshwater aquatic plankton
Freshwater Communities & Plankton

Planktons are microscopic organisms that live suspended in aquatic habitats. There are two groups: the phytoplanktons an..

Gene Pool and Speciation
The Gene Pool and Speciation

According to Charles Darwin's theory of natural selection, preferable genes are favored by nature in the gene pool, and ..

Schematic diagram of DNA replication
DNA Structure & DNA Replication

DNA is a double helix structure comprised of nucleotides. A nucleotide, in turn, is made up of phosphate molecule, deoxy..

Chemical composition of the body
Chemical Composition of the Body

The body is comprised of different elements with hydrogen, oxygen, carbon, and nitrogen as the major four. This tutorial..

Crossing Over
Dominance and Crossing Over

This tutorial presents Gregor Mendel's law of dominance. Learn more about this form of inheritance and how it can be pre..