O2 is a Gas , we aspire it from the air
Answer:
The answer should be C
Explanation:
If you look at the the graph, C points to the time period after mammals appeared. Since birds are mammals, they should have appeared after the time that mammals first came to be on Earth.
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All domestic mammals have seven cervical vertebrae.
C a salinity of less than 1%
I think it might be the second one sorry if I’m wrong