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.
Gene differences are so important among the population because they the distinctivnes of people
We need carrier proteins for steroid hormones because they help in the transportation from the cell they were released from to their target cell.
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Answer:
natural
Explanation:
All organisms have a natural habitat in which they live
Answer:
The continental crust is thicker than the
oceanic crust.
