Describe how blood serve the needs of some animal cells

You see a white marker with an orange circle and black lettering. what does this marker tell you

Which best describes carbon dioxide’s path out of the body

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