Consider this statement: Air is matter. Which facts best support the statement? Balloons can be filled with air. Air is essential for life to exist. Air has mass. Air is not an element. To float on air is to be happy. Air can’t be seen.

The facts that best support the statement "Air is matter" are:

1. Balloons can be filled with air: This shows that air occupies space, which is a property of matter.

2. Air has mass: One of the fundamental properties of matter is that it has mass.

3. Air is essential for life to exist: This doesn't directly prove that air is matter, but it shows that air has properties (like the ability to support life) that we associate with matter.

The other statements are not as directly related to the concept of air as matter. For example, "Air is not an element" is true, but it doesn't prove that air is matter - there are many things that are not elements but also not matter. "To float on air is to be happy" is a metaphor and not a physical property of air. "Air can’t be seen" is also true, but there are many forms of matter that can't be seen with the naked eye, so this doesn't prove or disprove that air is matter.