A cat's endocrine system is composed of several different types of glands and organs that produce the hormones of the body. A hormone is a chemical that is secreted by a gland in one area of the body and is carried by the bloodstream to other organs in the body, where it exerts some effect.
In 1672, Newton became a member of the Royal Societyâa group of scientists committed to the experimental method. He presented one of his new telescopes to the Royal Society along with his findings on light. The Royal Society set up a committee led by physicist Robert Hooke to evaluate Newton's findings. Hooke was a scientist employed by the Royal Society to evaluate new inventions. However, Hooke had his own ideas on light and was slow to accept the truth of Newtonâs findings.
Sir Isaac Newton. (/ËnjuËtÉn/ ; 25 December 1642 â 20 March 1726/7) was an English physicist and mathematician (described in his own day as a  natural philosopher ) who is widely recognised as one of the most influential scientists of all time and as a key figure in the scientific revolution.ewton built the first practical reflecting telescope and developed a theory of colour based on the observation that a prism decomposes white light into the many colours of the visible spectrum. He formulated an empirical law of cooling, studied the speed of sound, and introduced the notion of a Newtonian fluid.