Enzymes (blank) chemical reactions.

-speed up

-don’t change

-slow down

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

Which term describes a normal value for something in the body? a. homeostasis b. set point c. feedback loop d. integration center

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