Scientists can understand and learn about evolution by studying . However, whole and intact specimens are hard to come by. To study these specimens, scientists use technologies such as .

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

Which prefix mean under less or below

How are agricultural practices used today