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Which statement describes clean air as a natural resource? Select three options.

Clean air is essential for health and survival.
Clean air provides nitrogen gas for plant respiration.
Clean air is where high levels of ultrafine particles circulate.
Clean air reduces risk of illnesses and other health problems.
Clean air supplies oxygen that enables living organisms to breathe.

The correct answers are "Clean air is essential for health and survival", "Clean air reduces risk of illnesses and other health problems" and "Clean air supplies oxygen that enables living organisms to breathe".
Explanation:
Clean air is a natural resource that provides oxygen that enables living organisms to breathe by a series of complex interactions that involve the intake of carbon dioxide from photosynthetic organisms. Clean air is essential for health and survival because aerobic organisms, such as humans, need oxygen to obtain energy from food. Also, clean air reduces risk of illness and other health problems; particularly, the risk of having diseases related with the respiratory system.

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put like terms together.orremember that the 45 becomes negative when moved to the other side.orthe minuses cancel out.

On monday,mrs.wise bought 3 lbs of apples at $4per lb= 4*3=$12on tuesday ,20%off and she buy 5 lbs of apples = $4-20%=3.20*5lb=$16example: other wise when she buy 5lbs on monday she have to spend 4*5=20