What breaks down decaying organism?

When lactate builds up in a runners muscles it causes a burning sensation what causes this to occur

What does polymerase chain reaction (pcr) do? o a. separates dna fragments by size o b. cuts a dna sample into fragments o c. provides an overall picture of a person's chromosomes o d. makes more copies of a sample of dna

The diagram shows a chicken embryo and a human embryo