The answer is C. Photosynthesis.
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Answer:
C) skin cells.
Explanation:
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Answer: <span>Marbles placed inside a hollow sphere are used to describe protons in a nucleus.
Models are artificial representations used to show some phenomena or features of the real world.
In this case, it has been used a sphere and marbles, to represent the fact that nuclei of atoms contain inside some smaller partilces which are the protons.</span>
The build up in the child's ear prevent sound from reaching the eardrum.