Title: Prokaryote | Encyclopedia.com
Headings: 
Prokaryote
Prokaryote
Prokaryote
Prokaryote

Content: the archaebacteria and the eubacteria . Archaebacteria are probably little changed from the organisms that first evolved billions of years ago. They are capable of living in extremely harsh environments, such as salt marshes, hot springs, or even beneath the ice . Eubacteria evolved later. Some are photosynthetic bacteria; some are chemosynthetic bacteria, making carbohydrates from other chemicals besides carbon dioxide; and some are heterotrophic bacteria, deriving nutrients from the environment. Heterotrophic prokaryotes include some pathogens , bacteria that cause diseases, such as pneumonia , food poisoning , and tuberculosis . See also Eukaryotae. The Gale Encyclopedia of Science
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