DNA is a double helix structure comprised of nucleotides. A nucleotide, in turn, is made up of phosphate molecule, deoxy..
Animals living in aquatic habitats have diversified and evolved through time. They eventually occupy ecological niches a..
Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
This tutorial elaborates on how the nervous system works, particularly at the tissue level of the brain. There are three..
A sensory system is a part of the nervous system consisting of sensory receptors that receive stimuli from the internal ..
