20. The answer is 1 (Precambrian)
21. The answer is 4 (Pennsylvanian)
22. The answer is 2 (Bony Fishes, Dinosaurs, and Mammals)
23. The answer is 2 (Reptiles)
Answer: The answer is B
Explanation: It’s P2O3 and P4 and O3, to balance them you have to put a 2 in the first so it’ll be P4O6 ——— P4 , O6.
Both have a pump that pushes materials throughout the organism.
Hi there!! (✿◕‿◕)
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In glucose the hydroxyl group at carbon four is below the plane of the ring. In galactose the hydroxyl group at carbon four is above the plane of the ring.
Hope this helped!! ٩(◕‿◕｡)۶
