What types of adaptations would be needed by organisms that live in a river

Types of adaptations needed for organisms to live in a river are sunlight or lack of, the amount of bacteria living in the water, the temprature of the water, and the enviromemt that surrounds and is in the water.

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. 

Answeraquifer;