How can astronomers tell what a distant object's velocity is?
a by measuring the redshift or blueshift of the object
b by looking for particular lines in its spectrum
c by the frequency of the electromagnetic radiation it gives off
d by timing how long it takes light to reach the object and return

it is a

a adaptation is when organism changes itself to fit the environment

ex. when its cold outside i wear a jacket

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my google classroom is the code is 7hr2k4

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