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This is a synthesis reaction and the product(s) are aluminum oxide.

Explanation: Personally, I would solve calculate this without the 4 and 3 in front of Al and O2 because it just makes it more confusing. You would get the same answer if you did...

Al + O2 = Al2O3, which is also a synthesis reaction with a product of aluminum oxide (also sometimes called alumina).

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.

it's c (engineer's do their work with mechanical stuff not on any living being)