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People who exercise for an hour may have lower cholesterol levels. is that a statement? a law? or a hypothesis?

If two parents who's blood types are both b produce a child that has blood type o, what can you say about the parent's genotybes? oa) one is ii ob) one is ibi oc) both are bi od) nothing, this is impossible

What is the compliment dna strand to the following sequence: ttgactaggcta