Illnesses that pass from one organism to another are called diseases.

Body systems are not completely independent they integrate and work together describe one example of the integration between body systems

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass