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Answer</h2>
Nucleus: Protons and Neutrons
Electron Cloud: Electrons
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Explanation</h2>
An atom consists of three subatomic particles i.e Electrons, Protons and neutrons. Protons and neutrons are found inside of the nucleus of an atom whereas electrons are found in the orbits that surround the nucleus of an atom known as electron cloud. In the atom Protons contain positive charge to attract the electrons which contain negative charge and the neutrons contain no electrical charge.
The initial source of energy is sunlight
A sentence :
i read a book about "responding variable".
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When muscles are required to work harder than they're used to or in a different way, it's believed to cause microscopic damage to the muscle fibres, resulting in muscle soreness or stiffness.