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aalyn [17]
3 years ago
11

A primary air pollutant is put directly into air by human activity.What is a secondary air pollutant

Biology
1 answer:
Gnoma [55]3 years ago
4 0

Answer:

Acid Rain

Explanation:

Acid rain, which is made up of several acidic compounds, forms when sulfur dioxide and nitrogen dioxide react in the air with water, oxygen and other chemicals. On the ground, acid rain damages plants and trees and increases the acidity levels of soils and bodies of water, causing damage to ecosystems. Acid rain also causes decay to buildings and can irritate the eyes and airways.

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Option three should be correct
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is the movement of molecules from areas of low concentration to areas of high concentration and require energy.
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2 years ago
Which of the statements regarding the cell cycle is true? Group of answer choices It is regulated by cyclins and CDKs. Different
MA_775_DIABLO [31]

Answer:

All of these choices are correct.

Explanation:

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Cell cycle has major checkpoints where the condition of cell is analysed before it proceeds to the next stage of cycle. If any abnormality is detected, repair mechanism is activated or the cell is killed. Checkpoints do not allow cell cycle to proceed in damaged cells.

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