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.
C . My teacher use to say ly because you lie you're going to hell going down so c is definitely the correct answer
Answer:
The answer is: Receptor A because the ligand concentration is greater than the Kd.
Explanation:
Receptor A because the ligand concentration is greater than the Kd., because the conformation of a receptor protein composes the functional state. Ligands include substrates, inhibitors, activators, and neurotransmitters. So, Affinity is a measure of the strength of attraction between a receptor and its ligand.
Answer:
D. anything in the atmosphere.
Explanation:
