Density and matter are connected by their very definitions.
Density is defined as the amount of mass per unit volume. Basically, density is the amount of matter present in a certain volume of space. The more matter and the smaller the volume of space, the higher the density. Higher density pretty much means more matter squished into the same amount of space.
Explanation:
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The endocrine system "regulates" the reproductive system.
Ptolemy was an astronomer and mathematician. He believed that the Earth was the center of the Universe. The word for earth in Greek is geo, so we call this idea a "geocentric" theory.With the development of the heliocentric model by Nicolaus Copernicus in the 16th century, the Sun was believed to be the center of the Universe, with the planets (including Earth) and stars orbiting it.