Why does molecular polarity occur?

Polarity is caused when electrons in a covalent bond are not equally shared.
A molecule's polarity is caused when the two nuclei making up the molecule are different sizes.
Polarity is caused when electrons are shared equally in a covalent bond.
Polarity is caused when electrons are taken by one atom in an ionic bond.

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them  

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.