Describe one factor that can make relative dating difficult

It's probably because some types of violets are blue

Iwould say d. eye contact and body language because you aren’t using any spoken communication. hope this : )

Answer steam fog;

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.