What causes smog in L.A. and in Mexico City? Describe at least factors.
The smog is trapped in the valley and cannot be carried away by wind.
Describe one change to factories and power plants intended to reduce air pollution.
Reducing toxic emissions from industrial sources, reducing emissions from vehicles and engines through new stringent emission standards and cleaner burning gasoline; and addressing indoor air pollution though voluntary programs.
Describe one change to automobiles and buses intended to reduce air pollution.
Using fuel efficient vehicles, or electric vehicles.
Describe one way that commuters can now reduce air pollution.
Choose a cleaner commute, share a ride to work or use public transportation. Combine errands and reduce trips. Walk to errands when possible. Avoid excessive idling of your automobile.
Genetic variations can arise from gene mutations or from genetic recombination (a normal process in which genetic material is rearranged as a cell is getting ready to divide). These variations often alter gene activity or protein function, which can introduce different traits in an organism.
The answer would be A. The other options combine their molecular structure, while the vinegar and soy sauce stay separated.
