heat definition In physics, a form of energy associated with the movement of atoms and molecules in any material. The higher the temperature of a material, the faster the atoms are moving, and hence the greater the amount of energy present as heat.
Cilia (singular: cilium) are microscopic, hair-like structures that extend outwardfrom the surface of manyanimal cells. These structures are important in the cell cycle and replication, and cilia play a vital part in human and animal development and in everyday life. A typical cilium is between one and ten micrometers long, and usually less than one micrometer wide.
Ciliophora is the name for a phylum of protists commonly called the ciliates. Ciliates are the most complex of cells, having an elaborate cytoskeleton, cilia and two different kinds of nuclei. Freeâliving ciliates can be found in almost any habitat that has water â in soils, hot springs and Antarctic sea ice.