Science question : What does a woman have two of that a cow has four of?

A solitary called life form would have an external covering in particular. Clarification: Having a brain, legs and inner organs is excessively perplexing for a unicellular organism(organisms with one cell)

Explanation:

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.