Multicellular Organisms
18 Feb 2008Increased 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...
ERNEST SENAYA
ERNEST SENAYA:
speeches
Propulsion By Propellers
18 Feb 2008Moving a vehicle, may it be on the ground, on the water, or in the air, requires a force to overcome the friction and inertia forces and to lift the vehicle to a different elevation. A force can be cr...
- 442
speeches
The First Molluscs
18 Feb 2008Other 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 ...
- 629
business-sense
How To Boost Company Productivity Through Incentives
18 Feb 2008Many 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...
- 484
general-articles
The Dragon Fly
18 Feb 2008The characteristics of six legs and a body divided into three parts became numerically the most successful group of animals: the insects. Although ancestral insects probably climbed about the vegetati...
- 736
general-articles
The Sticky Tongues Of Lizards
18 Feb 2008They are all carnivorous, and indeed some are quite formidable such as the horned toads (Family Leptodactylidae) which can easily prey on a nestling bird or a small vertebrate such as a mouse. Alt...
- 710
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