tissue extracts preparations made from animal tissues or organs; they usually contain many components, any one of which may be pharmacologically or physiologically active; extracts may contain specific, but uncharacterised factors or proteins with specific actions...
The water cycle (also referred to as the hydrological cycle) is a system of continuous transfer of water from the air, s..
This tutorial digs into the past to investigate the origins of life. The section is split into geological periods in the..
Hormones are essential in the regulation of the activity of the various biological systems of the human body. The ineffi..
Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..
Different mental disorders are described here. Read this tutorial to get an overview of schizophrenia, affective mood di..
Plants produce hormones to regulate their growth. Auxins, for instance, influence plant growth. Know the role of auxin i..
