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Because the life sciences messily overlap (that's life), terms from botany, biology, geology, chemistry, meteorology, and agriculture are included as well.
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Animals: the animal kingdom branches into the deuterostomes (mouth and anus develop separately) and the protostomes.
Animals are multicellular and possess mitochondria, a complex nervous system, and cells protected by a membrane and filled with complex organelles.
Most of it is generated by sulfur dioxide and nitrogen dioxide (air pollution). Results include fish and plant deaths, corrosion, groundwater pollution, and soil erosion. Actinomycetes: formerly classified as fungi because of their filaments, the actinomycetales include many types of soil bacteria.
They produce antibiotics, enzymes, and vitamins, although a few are harmful to humans.
The glossary that follows assumes a definition of ecology--the study of interactions between organisms and their environment--much wider than what fits under the field's habitual statistical persona.