A. It has mass.
Air is matter, and can't be seen thus not all matter can be seen.
Any liquid or gaseous is matter (water, air, etc.)
Since it can be liquid or gaseous it doesn't have to maintain it's shape and size to be matter.
the ice because the albedo value is high
Answer:the answer is the second
Because cell wall made up of most cellulose while cell membrane the outer if the animal cell
The chemical equations for the processes are opposite of each other
