porifera
(Science: zoology) A grand division of the invertebrata, including the sponges; called also spongiae, Spongida, and spongiozoa. The principal divisions are Calcispongiae, keratosa or fibrospongiae, and silicea.
Origin: NL, fr. L. Porus pore – ferre to bear.
If the balance of nature is left untouched, landscapes can change dramatically over time. A previous ecosystem is supers..
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
Meet the colorful takahē, an extremely rare flightless bird. Find out more about its unique features and why they matte..
Earth was created around 4.5 billion years ago and life began not long after. Primitive life likely possessed the elemen..
Hormones are produced in the endocrine glands of animals. The pituitary gland and hypothalamus are the most impor..
This tutorial elaborates on the effect of light on plant growth. It describes how different plants require different amo..
