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.
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Answer:
plants make their own food with photosynthesis
Carnivore and Omnivore organisms eat other organisms
Explanation:
I tried to explain as best as I could I dont see your direct question I hope I helped
Loss of genetic variation.
Hope this helps!
-Payshence
