People's activities the physical environment and the physical environment people.

may affect, may affect

Explanation:

People's activities like forests fire, deforestation, bomb explosion, burning of fossil fuels can negatively affect the physical environment. It will contaminate the air, water and soil. This will likely to affect people as contaminated environment will cause respiratory diseases, increase incidences of infection due to chemical hazards and can also be lethal.

i'd say from a moral standpoint, the brains are both of equal value.

explanation:

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