I believe for number 1 the answer is A 260
Underwater Ways!
The Aquarius Reef Base is an underwater habitat 5.4 meters off Key Largo in the Florida Keys National Marine Sanctuary. It is deployed on the ocean floor 62 ft below the surface and next to a deep coral reef called Conch Reef.
(That is all I can tell you.)
Answer:
Yes
Explanation:
No matter what age, trees still give out oxygen. It may not be the same amount as an older tree, but it still has the same effect.