What process is shown most directly in the diagram below? Electrodes 70 60 25 10 5 D of fragment sizes Kilobase Wells Agarose Gel Chamber filled with Unknown DNA size samples buffer solution

A. Gel electrophoresis

B. Karyotyping

C. Polymerase chain reaction (PCR)

D. Use of restriction enzymes

Patricia is told by her physician that her body and brain chemistry have physically adapted to the drug and that she has become dependent on the tranquilizers prescribed for her by another doctor.

Which statement describes characteristics of planarians? a they live in oceans, are parasites, and reproduce only sexually. b they live in fresh water, are parasites, and reproduce only asexually. c they live in oceans, are free living, and reproduce sexually and asexually. d they live in fresh water, are free living, and reproduce sexually and asexually.

Which structure in the cardiovascular system connect arteries to veins?