Answer:
Difficulty
Explanation:
Space exploration was the last thing the world could have thought of dabbing into because the idea of moving away from the earth and flying in the sky wasn't even an easy one for man, hence the difficulty attached with going into other planets was a big success.
Many trials were made before the eventual success experienced, this many difficulties man overcame is what is meant by barrier in this sense.
Answer:
<u>Secondary Source</u>
Explanation:
They talk about how they werent there and they could have summarized another piece of writghting(The Primary Source).
Hopefully this is correct and gets you some help. if I am wrong please correct me. Have a wonderful day! :)
the answer is C, "The Wizard of Oz" (quotation) because it is referring to it.
