Stigmata

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

Plant organs are comprised of tissues working together for a common function. The different types of plant tissues are m..

Hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..

This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..

While learning and intelligence are associated with the functions of a conscious mind, sleep and dreams are activities o..

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

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