Is this sentence correct or do i need to add a coma before ‘and.’ at the mint, tony watched the complicated, intricate processes of taking bills off the assembly line and packing the money.

You do not need to add a comma. It is written correctly :)

d. the two authors are in awe of nature; their experiences, reveal that time in nature can change people.

explanation:

the answer is subjective. i personally agree with the first answer for this question.

if one isn't strictly talking about objects then the correct answer would be 'my eyes' since according to this riddle i am asleep and in order to answer/open the door i need to open my eyes first of all.

however, if one is specifically looking for an object, then the first thing i would open would be the door

hope this !