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7.4 Homeostasis and Cells
Transcript of 7.4 Homeostasis and Cells
Some types of algae, which contain chloroplasts, are single celled. Heart Cell Nerve Cell Bone Marrow Cell Levels of Organization First Level
Cell Second Level
Tissue Third Level
Organ Fourth Level
Organ System Fifth
Organism Archaebacteria Methanogens The methanogens are anaerobic bacteria that produce methane. They are found in sewage treatment plants, bogs, and the intestinal tracts of ruminants. Ancient methanogens are the source of natural gas. Halophiles Halophiles are bacteria that thrive in high salt concentrations such as those found in salt lakes or pools of sea water. Thermophiles Thermophiles are the heat-loving bacteria found near hydrothermal vents and hot springs. Many thermophiles are chemosynthetic, using dissolved sulfur or other elements as their energy source and iron as a means of respiration. Archaebacteria emerged at least 3.5 billion years ago and live in environments that resemble conditions existing when the earth was young.