How are Cyanobacteria related to the atmosphere? A. It is believed they were the first oxygen producing organisms
B. They are believed to produce carbon dioxide into the atmosphere
C. They fed off the abundant nitrogen in the atmosphere

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

Why did southern business leaders want to increase the number of slaves

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together