The first signs of Huntington’s disease often appear when a person is in his or her 30s and 40s, but it can appear later in life. The earliest symptoms are often subtle, such as mood changes. Do you think the subtle presence of symptoms plays a role in this harmful gene persisting in our population?

the fossil record provides evidence of a common ancestor to many species.

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imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.

a. an idea which cannot be disproven!

explanation: