Tapeworms enter the human stomach through food. they feed on nutrients in the stomach and cause infections in the body. what does this association depict?

a. tapeworms share a mutualistic association with humans.
b. the tapeworm is a parasite of humans.
c. humans share a commensal association with tapeworms.
d. the human is a parasite of the tapeworm.

Depending on the organism the number of in a cell may change

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.

Which of the following types of pollution is most responsible for large numbers of deaths worldwide because of unsafe drinking water? (a) nutrient pollution (b) thermal pollution (c) pathogen pollution (d) sediment pollution