Which of the following phrases describe the function of the digestive system? Select the two best answers. I. Smooth, muscular tube connects the mouth to the stomach
II. Muscular action in the esophagus pushes food to the stomach
III. Structures called microvilli increase the surface area of the intestines
IV. Nutrients are made available to the body’s cells

Options I & II

I. Smooth, muscular tube connects the mouth to the stomach

II. Muscular action in the esophagus pushes food to the stomach

Explanation:

In digestive systems, we have what we call esophagus. The process is that;

The esophagus we have is a tubular like organ which connects the mouth to the stomach. Now, when we chew food and it's soft, the food will pass through the esophagus after we have swallowed it.

The smooth muscles of the esophagus will now undergo peristalsis which is a series of wave like movements that will push the food toward the stomach.

Thus, we have seen that the esophagus is a smooth tube and that muscle action on it enables the food to be pushed down the stomach.

Thus, options I & II are correct.

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell

the potential energy of the reactants is 200j.

from the energy diagram, the energy of the product formed is 350j; this means that, this reaction is an endothermic reaction, because it absorbs energy from its environment.