2.c
3.b
1.a
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Probably for the umbilical cord that connects babies (from their early stages in the womb to their removal) to their mothers. The cord is cut, forming the belly button. This is analogous to astronauts in space.
Due to attraction ... of opposite charges
Answer: It states that the BCD equivalent would be 0001000100000000000100010001000100010000000100000001000000000001.