Which of the following statements best defines the oxygen-hemoglobin dissociation curve? a) a graphical representation of the amount of oxygen found in the atmosphereb) a graphical representation of the relationship between hemoglobin's percent saturation and the partial pressure of oxygenc) a graphical representation of the amount of hemoglobin found in the bloodd) a graphical representation of the amount of oxygen bound to hemoglobin and how that affects the partial pressure of o2 in the blood

Which member of the following food chain will be least affected by ddt, a pesticide water pollutant, if bio-magnification is occurring? algae> zooplankton> crayfish> leopard frog> large mouth bass

Resperation is a way to release carbon back into the atmosphere

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.