The formation of complex organic molecules from simpler inorganic molecules through chemical reactions in the oceans during the early history of the Earth; the first step in the development of life on this planet. The period of chemical evolution lasted less than a billion years.
Note: Many of the steps in chemical evolution can now be reproduced in the laboratory.
Note: Some scientists believe that all or most of the Earth’s original organic molecules were created in space and were brought to the Earth’s oceans by meteorites.
noun 1. a distinctive characteristic or pattern indicating the presence of a certain molecule, used to identify a chemical.
[kem-i-kuh l] /ˈkɛm ɪ kəl/ noun 1. a substance produced by or used in a chemical process. 2. chemicals, Slang. narcotic or mind-altering drugs or substances. adjective 3. of, used in, produced by, or concerned with or chemicals: a chemical formula; chemical agents. 4. used in : chemical weapons. /ˈkɛmɪkəl/ noun 1. any substance used […]
Trademark. 1. . [meys] /meɪs/ Trademark. 1. a nonlethal spray containing purified tear gas and chemical solvents that temporarily incapacitate a person mainly by causing eye and skin irritations: used especially as a means of subduing rioters. /meɪs/ noun 1. a club, usually having a spiked metal head, used esp in the Middle Ages 2. […]
[cheer-lee-der] /ˈtʃɪərˌli dər/ noun 1. a person who leads spectators in traditional or formal , especially at a pep rally or athletic event. /ˈtʃɪəˌliːdə/ noun 1. a person who leads a crowd in formal cheers, esp at sports events n. also cheer-leader, 1900, American English, from cheer (n.) + leader. Cheerleading is attested from 1906.