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The answer is A a breed. ...
It means that you have to get up take two vitamins a day hope this helps
Tissue culture is the growth in an artificial medium of cells derived from living tissue.
If some living things do not reproduce this could be considered a defect or a genetic mutation in those people. If we take humans for example, if most humans reproduce and some don't because they cannot (if a guy cannot produce sperm) this doesn't mean that he isn't alive, it just means he was born with a genetic mutation which doesn't allow him to produce sperm needed for reproducing.
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They help medical do more by helping because they give more assistance.