an exchange; in business this usually involves money

two or more atoms chemically combined

able to return to original shape or size after stretching

something needed to complete or make perfect

hot and humid; near to the equator

To make into something at an industrial level

a package or box wrapped in paper, a thing bigger than a letter that is sent in the mail

a vehicle that carries passengers or items between two places

a small hard part of something smooth, soft, or continuous

an electronic signal that has been sent by radio waves; a force that has been transferred from one machine to another