Air pollution in us and canadian cities is caused mostly by a. clear-cutting forests for timber b. releasing emissions from vehicles and industry c. dumping runoff from farms into rivers d. harvesting minerals from mines

Most air pollution in United States and Canadian cities is caused by vehicle and industrial emissions. The correct option among all the options that are given in the question is the fourth option or option "D". This has led to increased amount of global warming. I hope the answer has helped you.

the answer is: must pay taxes on profits

since it is considered as a part of your income, profits from investments is eligible for tax payment.

the tax from your investment could be influenced by how long you decided to sell it. united states promotes keeping your investment for long term period. so, the tax rate for investments that you sell in less than one year is typically higher compared to investments that you sell in more than one year period.