Al has a pet cat. one day he observes that it is scratching and urinating on tree trunks in his yard. what behavior is al's cat displaying? a. protection b. predation c. territoriality

During endocytosis, cells expel what they don't need take in what they need shrink due to loss of water

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

Where are the strongest jet streams located?