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go help me on my 3 question please
Wave velocity in common usage refers to speed, although, properly, velocity implies both speed and direction. The velocity of a wave is equal to the product of its wavelength and frequency (number of vibrations per second) and is independent of its intensity.
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cell membrane
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Single cell organisms like the bacteria depend mostly on diffusion for gaseous exchange. They take in food that does not require complex digestion processes. The cell membrane is selectively permeable and allows absorption of nutrients like glucose that have molecules of small size.
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As you get higher up the spinal chord it branches out further into more nerves branching off into the body. These nerves will be affected negatively. The further up the injury, the more nerves are damaged. It is also getting closer to the brain stem so there is a higher chance of widespread paralysis.
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