5. Which of these CANNOT result in evolution? O Mutations O Natural selection OSmall population size O Horizontal gene transfer O Emigration or immigration O All of the above can result in evolution 6. A mutation occurs in the DNA sequence of a kangaroo, such that a nucleotide containing cytosine is swapped for one containing adenine. Which complementary base will be paired up with the new adenine- containing nucleotide? O Cytosine Guanine Adenine O Thymine None of these bases

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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.