Leukemia affects the bone marrow and develops gradually. a. acute myelocytic b. acute lymphocytic c. chronic lymphocytic d. chronic myelocytic

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.