What normally serves as the pacemaker of the entire heart?

Select the correct answer. in the image, if the washcloth represents consumed food, which organ of the digestive system correctly represents the action performed by the hands? hands squeezing water from a washcloth a. esophagus b. large intestine c. liver d. mouth

When the oxygen produced by photosynthetic plants in the water dissolves in the water, which of these is being formed?

What might explain the real-world results, show in the graph to the right, for one class of twenty students? check all that apply.