After scientists realized that the factory poifution was causing environmental changes, filters were put in place to reduce the amount of soot that was getting into the air.

Because the earth is not round ,but it may seem round when viewed from ,our planet but true some points earth is not round was an oblate spheroid -a square that it squashed as globe however is not even a perfect oblate spheroid.in fact isaac newton's first proposed that earth was not perfectly round but it was an oblate spheroid instead.that mean a square that is squashed as its poles and swollen at the

If you remove all the lions from the savanna it will lead to a increase of gazelle and a increase of cheetahs becasue of no competition