Many companies today are realizing that they need a better way to retain, reward, and motivate their employees. The age-old practice of annual raises does little to excite a worker's discretionary eff...
All you need is: * aluminum foil, * a few paper clips, * an empty aquarium (or similar large container) * and water Here's what you do: 1. Partially fill the aquarium or...
When rocks occur as undisturbed layers, we find that the lowest layers will be the oldest and topmost layers will be the youngest. Frequently rivers cut incisions into the earth's surface and expose s...
Under a chameleon’s outer skin are special skin cells with colour (or pigment) in them. These cells are called chromatophores. The top layer of chromatophores have red or yellow pigment. The lower lay...
Increased co-ordination between colonial cells appeared with the evolution of the sponges (Porifera). Sponges may be formless lumps on the sea floor reaching two metres in size. Their surfaces are c...
Other kinds of annelids also developed in which the animal did not attach itself to the sea floor but continued to crawl and secreted a small conical tent under which it could escape from predators ...
