The First Chinese civilizations began on the River Huang He (Yellow)
Tigris
Ganges
Xia
Nile
Euphrates

Huang He (Yellow)

Explanation:

Tigris, Ganges, Nile, and Euphrates are from Mesopotamia and Egypt. I also just searched it up.

hello it is $0 for apex

d. i assume the underlined word is "role." reformat if it isn't.

explanation:

role is closest to part because when replacing words, "playing a vital decision," "playing a vital activity," and "playing a vital dollar" don't make logical sense. the only meaningful choice is "playing a vital part."

this fits one of merriam-webster's definitions of role: "a function or part performed especially in a particular operation or process."