Compare protons ,electrons, and neutrons with respect to location within atoms, eletric charge and mass

Protons are positively charged, Electrons are negatively charged, and Neutrons are neutrally charged as in no charge positive or negative.

Protons and neutrons are in the middle (nucleus) of the Atom while the electrons are in shells or orbitals that surround the nucleus of an atom.

Protons have +1 mass, electrons have -1 mass, and neutrons have 0 mass.

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answer; i believe the correct answer is (anemia);

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.