Answer:
You say there is one twin. Twins, when referred to as a set, require an s, just like most other groups of objects. There are the twins.
The cell would not split as it should
I don’t understand the question, is there more context you can provide? A central claim is a statement asserting a belief provided with evidence
I think it only contains 2 phonemes
A strict character might be very co servant or gets mad or gets frustfrated in small events.
