It can possible be you're arteries or also you're intestines with is large and small.
Physical change- evaporation , condensation
Chemical change- combustion , neutralization
Answer: A. Most radiation reaching Earth from space is blocked by the atmosphere. Therefore, some telescopes must be placed above the atmosphere.
Explanation: Astronomers have a huge problem detecting radiation from space because the Earth's atmosphere blocks most of it and stops it from reaching the surface.
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