Explanation:
nucleus
Over 99.9 percent of an atom's mass resides in the nucleus. The protons and neutrons in the center of the atom are about 2,000 times heavier than the electrons orbiting around it.
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Is call an topoghapic map.
If I answer it then its not in your own words…...
D. parasitism
The flea is gaining nutirents but since the dog is being harmed the flea is a parasites