Once a molecule of DNA has been replicated many times (usually about 50), it is no longer able to function properly. Why does the molecule stop functioning after many rounds of replication?

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

protistas excret ethanol used in the manufacture of vinegar