The thin, narrow structure of the capillaries is well-suited to their function because the capillaries
1. only carry the liquid portion of blood
2. transport substances directly to the body cells
3. require only a small amount of oxygen to function
4. have the opposite function of arteries and veins

c, 1a hope this

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explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."