Which of the following technological advancements was necessary before scientists could study samples from the surface of the moon

Flight was necessary before scientist could study samples from the surface of the moon.

Explanation:

Scientist would have never been able to lift off of the ground here on Earth without the there being the first flight, nevertheless the moon haha

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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