5. about 99% of the atmosphere is composed of
a. argon and carbon dioxide.
b. oxygen and carbon dioxide.
c. nitrogen and water vapor.
d. nitrogen and oxygen.

i need this answer before aug. 31st

Humans have survived and thrived in mexico city by using technology to create greater access to land. when the spanish conquered the aztec capital, tenochtitlan, in the 16th century, they built mexico city by draining the lakes and filling in the lake water to create more arable land for agriculture. this technique of land reclamation has continued to be fundamental to human civilization in mexico city. 

Ibelieve that is false not 100% tho