Why is radioactive dating able to be used with such
accuracy?

We have rocks from the Moon (brought back), meteorites, and rocks that we know came from Mars. We can then use radioactive age dating in order to date the ages of the surfaces (when the rocks first formed, i.e. when the lava cooled and crystallized). We also have meteorites from asteroids and can date them, too.

Explanation:

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well, i believe that the answer is 2. : 3

d. organisms have cells with different shapes and functions.