Humans are diploid creatures. This means that for every chromosome in the body, there is another one to match it. Howeve..
Hormones are chemical messengers produced by specialized glands and they were produced by switching on the genes designe..
Geological periods is a study guide that cites the different geological periods on Earth's timeline. Each has a brief ov..
Multicellular organisms evolved. The first ones were likely in the form of sponges. Multicellularity led to the evolutio..
The nervous system is essentially a biological information highway. This tutorial gives an overview of the nervous syste..
A balanced diet is essential to a healthy organism. Insufficiency or too much of a particular element or compound, such ..