Hornwort
Ceratophyllum demersum
Size: to 10 ft
Habitat: beneath the surface in quiet waters
Notes: May form dense thickets
We seldom consider the water we dive in, yet it is a fascinating subject in its own right.
Basic Chemistry
Water is an odorless, tasteless, transparent liquid that is colorless in small amounts but exhibits a bluish tinge in large quantities. It is the most familiar and abundant liquid on earth. In solid form ( ice ) and liquid form it covers about 70% of the earth's surface. It is present in varying amounts in the atmosphere. Most of the living tissue of a human being is made up of water; it constitutes about 92% of blood plasma, about 80% of muscle tissue, about 60% of red blood cells, and over half of most other tissues. It is also an important component of the tissues of most other living things.
More: Water Composition ...