Which statement is true about fossils?

Which situation is an example of not doing work? lifting a couch throwing a baseball running up stairs carrying a box

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

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water