While learning and intelligence are associated with the functions of a conscious mind, sleep and dreams are activities o..
Apart from vitamins, the human body also requires high energy sources such as carbohydrates and fats. If you want an ove..
This tutorial investigates perception as two people can interpret the same thing differently. Know more about human perc..
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
Autotrophs flourished, absorbing carbon and light. Soon after, primitive life forms that could assimilate oxygen thrived..
In plants, growth occurs in meristems, which are the site of repeated cell division of unspecialized cells. These cells ..
