What words does the author use to emphasize the concept of outer space as an eternal frontier? a all that has gone before was preliminary b everlasting challenge to explorers c the line that separates the know from the unknown d mankind is not bound by its atmospheric

The author uses ‘everlasting challenge to explorers’ to emphasize the concept of outer space as an eternal frontier.  

Explanation:

In this question, option B is the correct answer. This is because it is emphatic and agrees with the given sentence. It is also grammatically correct. In the given sentence, the author wants to focus on the difficulties and the problems that the explorers will have to face in their expedition.

He wants to explain to us the hardships and the thrill about the outer space that the explorers are about to go through.

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to whom may it may concern;

i have recently ordered a product from your online shop. the shipping details read that my order would be delivered by the 8th of december, whereas it was delivered the 13th. i needed the package for a christmas exchange. 

since i paid for overnight shipping, but did not receive the package in the time allotted, i am kindly asking for a refund. the product was just perfect, but i do not believe i should have to pay for a quick shipping if it came late.

you for your time, i hope to hear from you soon.

sincerely,

john smith