I think it's D. It shields life forms on the surface from radiation?
Yes they did. It is generally known that amphibians breathe through their skin.
Answer:
trachea is not part of that system, that's a different system.
Explanation:
The answer is C. thousands of galaxies
because<span> Hubble found 10,000 of galaxies just by observing one small little area in space.
So, it has to be thousands.</span>
Bacteria can replicate themselves.
