A doctor need to study chemistry: To know and understand the chemicals processes of matter in the body work which is for example insulin, DNA etc. and to study of all processes in a living organism. The three reasons to study chemistry is because chemistry can be useful in clearing up the natural world, preparing people for career opportunities and producing informed citizens. Some outcomes of modern research in chemistry can lead to technologies that aim to benefit the environment, preserve and produce energy, progress human life and multiply our knowledge of the universe. To help the citizen be a more informed citizen is to let them know how things work makes better decisions and use them better
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⇒<em>These abiotic and biotic factors interact with each other, keeping the ecosystem and environment moving along. The biotic and abiotic components are linked together through nutrient cycles and energy flows</em>.
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D. BB x Bb
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<u><em>I will add this either in the comments of this answer or I will edit the answer after posted</em></u>
The geologic time scale is organized into eras, and the eras are organized into periods.