19. For each of the following definitions, give the appropriate term and spell it correctly. Terms are single words unless indicated otherwise. a. Any chromosome other than a sex chromosome. b. Site on a chromosome to which spindle fibers attach. c. Adjective applicable to a chromosome with arms of about equal length. d. Adjective referring to the number of chromosomes in a gamete. e. Reduction division.

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Environmental health and hazards

An organism's environment is the environment in which it lives and has an impact on its well-being. The World Health Organization (WHO) defines environmental health as "those aspects of public health, such as quality of life, that are influenced by physical, chemical, biological, social, and psychosocial components in the environment." Environmental health is concerned with both natural and man-made settings in order to enhance public health. Environmental science, occupational medicine, toxicology, and epidemiology are the key subdisciplines of environmental health.