Cyanobacteria produced oxygen in the ocean. Any of various nucleic acids that are the molecular basis of heredity, are localized especially in cell nuclei, and are constructed of a double helix held together by hydrogen bonds. Because DNA stores the cell s genetic information, it is like the blueprint of a living cell. Warming of the surface and lower atmosphere of a planet caused by conversion of solar radiation into heat. The process of gases trapping heat from the sun in the Earth s atmosphere is called the greenhouse effect.
Underwater volcanoes can form hydrothermal chimneys.
Mitochondria supply the cell with energy by hosting the reaction between glucose and oxygen. A cellular organelle in eukaryotes that is essential to cell functions, composed of nuclear sap and a nucleoprotein-rich network from which chromosomes arise, and is enclosed in a definite membrane. The building blocks of life accumulated in a primordial soup of chemicals. Vocabulary Quiz Whiz Create a variety of interesting quizzes to test your students' word power. Puzzlemaker Send your students home with word searches, crossword puzzles and more.