Several tissues grouped together and working as a unit are called

organ

Explanation:

Several tissues grouped together and working as a unit are called organ

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Several tissue groped together and working as a unit is called organ.

Explanation:

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significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.