Why can positive feedback be dangerous if it continues on for too long?

Gregor mendel was the first scientist to use statistics to analyze scientific data before mandel's experiments, scientists believed that organisms acquired traits from their environment and pass them on to their offspring after mendel's discoveries were accepted scientists realized that traits passed to offspring were the result of genes being passed from parent to his parents this is an example of

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?