chemoreceptor (kÄÂ´mÅrÄsepÂ´tÉr) , n a specialized sensory end organ adapted for excitation by chemical substances (e.g., olfactory and gustatory receptors) or specialized sense organs of the carotid body that are sensitive to chemical changes in the bloodstream.
Nicolaus Copernicus was born on 19 February 1473 in the city of ToruÅ (Thorn), in the province of Royal Prussia, in the Crown of the Kingdom of Poland.His father was a merchant from Krakow krakÃ³w and his mother was the daughter of a Wealthy toruÅ. Merchant nicolaus was the youngest of four. childrenopernicus was born and died in Royal Prussia, a region that had been a part of the Kingdom of Poland since 1466. He was a polyglot and polymath who obtained a doctorate in canon law and also practiced as a physician, classics scholar, translator, governor, diplomat, and economist.
Copernicus was Galileo Galilei's friend. [No. Copernicus died in  1543, before Galileo was born (1564).] Copernicus proved that the  Sun, not the Earth, is in the center of â¦the solar system, the  planets, including the Earth, revolving around the Sun.