Stars are the spherical object according to Aristotle's geocentric model.
<h3>Aristotle's geocentric model</h3>
Aristotle's model of the universe was also geocentric in which the Sun, Moon, planets, and stars all orbiting the Earth and present inside of Eudoxus' spheres and also revolves around the planet earth.
Aristotle believed in a geocentric Universe and that the planets and stars were perfect spheres, but the Earth itself was not a perfect sphere so we can conclude that Stars are the spherical object according to Aristotle's geocentric model.
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Cell wall and chloroplast
The relationship between osmosis and aquaporins are usually found is some vital physiological functions like the water re-absorption in the kidney. It is even found in the secretion of the glands and airways. Also in the water hemeostatis in the brain. In this functions osmotic waters transports in aquaporins.
The answer to your question would be Titin. Hope this helps:)