1. The frequency of the allele that codes for wide paws in a large population of koala bears stays constant over time, generation after generation. This can be best described as an example of: Genetic drift Bottleneck effect The Hardy-Weinberg Principle 2. A wild forest fire wipes out most of the ants in a colony, drastically reducing the size of that population. As a result, there is a dramatic (although temporary) reduction in the frequency of the allele that codes for a long torso. This is best described as an example of: Genetic drift O Bottleneck effect O Founder effect The Hardy-Weinberg Principle O Founder effect

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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.