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Which sentence is more correct and which form of verb should be used for the last sentence?
The energy of sample A and the energy of sample B increase.
The energy of sample A and that of B increase.
The energy of each sample A and B increase.
The energy of sample A and B increase(s).
The questions can be simplified by identifying the subject(s).
1. energy and energy increase
2. energy and that increase
3. (not quite grammatical)
4. energy increases
(But note that if the energies of A and B are independent, 4 would be better as
4a. The energies of sample A and sample B increase.)
