It’s the second one. In photosynthesis plants take carbon dioxide and water to make glucose and oxygen. Hope this helps!
I would answer but you didn't put any pictures so I can't see what shows anything.
Some agree its in the billions range somewhere close to 3 billion.
Answer:
The major evolutionary changes was overtime Pakicetus had an earbone with a feature unique to whales and an ankle bone that linked it to artiodactyls.