Which of the following is more common today?
a. london-type smog
b. photochemical smog
c. acid smog
d. none of the above

b. photochemical smog

Explanation:

Photochemical smog is the most common type of smog. It is produced when the ultraviolet rays in sunlight reacts with the nitrogen oxides present in the atmosphere.

It can be seen as visible brown haze. It can be seen in morning and in afternoon. It can be seen in cities which are densly populated.

The largest contributor to the formation of photochemical smog are automobile emission, and coal power plants.

not the best question format lol but what i think might as scale color is controlled by a single gene with two alleles, the green allele and the yellow allele. when moths that are homozygous for green scales are mated with moths that are homozygous for yellow scales, 100% of the offspring have green scales.

coal is not sustainable because it will one day run out.