B) Oxygen may not have been able to accumulate in the atmosphere
The answer is C) Cloning eliminates the ability to sexually reproduce and provide genetic variability.
In the future, there is no variability in the genes in the clones given that they are the exact copies of the "parent" produce. All should be identical without differences and variations. Although Farmer Brown doesn't want this to happen that's is what he is reluctant to listen to Farmer Green's advice.
I think its ADP to ATP then NAD+ to NADH
They are primary subtractive colours, because each of them can be formed by subtracting a primary additive colour from the white light (blue, green, and red).
