planaria
Origin: NL. See Planary.
(Science: zoology) Any species of turbellarian worms belonging to Planaria, and many allied genera. The body is usually flat, thin, and smooth. Some species, in warm countries, are terrestrial.
Ferns and their relatives are vascular plants, meaning they have xylem and phloem tissues. Because of the presence of va..
Plants, like animals, produce hormones to regulate plant activities, including growth. They need these hormones to respo..
Molecules move within the cell or from one cell to another through different strategies. Transport may be in the form of..
If the balance of nature is left untouched, landscapes can change dramatically over time. A previous ecosystem is supers..
The kidneys are responsible for the regulation of water and inorganic ions. Read this tutorial to learn about the differ..
Explore why New Zealand has such unique flora and fauna, and learn why long periods of geographical isolation. This less..