I'll give brainliest for correct answer. We know that the electromagnetic spectrum uses wavelengths and frequencies to determine a lot about outer space. How does it help us find out the make-up of stars? Why might it be useful to determine the elements that a planet or moon is made up of?

It helps because, the stars give off the radiation that is in electromagnetic spectrum so that is how it helps. Also, it could help us determine what the moon nd planets are made of becasue they can see that stars are defintly made of a different meterial.

Explanation:

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c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.