Answer:A
Explanation:<em>The core is a solid in the middle and molten on top of it</em>
Answer:
- Peristalsis.
Explanation:
- Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract. It starts in the esophagus where strong wave-like motions of the smooth muscle move balls of swallowed food to the stomach.
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Substances formed by joining smaller molecules together are called macromolecules. Examples for macromolecules are: carbohydrates, lipids, nucleic acids, and proteins. They are large biological molecules necessary for life: they power our cells and build our bodies.
Hummm... i think the answer is.. D....
Hope this is correct!
