If two or more substances are combined what is always created? molecule

compound

chemical compound

mixture

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

Suppose the universe were completely empty except for one object-a solid sphere moving through space of 100 km/s. what sort of path would the object be moving in? explain your answer

Which of the following are sources of revenue for media companies? a. direct sales to producers b.advertising and subscriptions c. online purchase d. capital investments