Which human activity has the most negative effect on the stability of a river enviorment

Littering

Explanation:

100 people throw 100 plastic bags in the water. Big mistake. AND THAT'S JUST 100 PEOPLE! Imagine thousands of people every year and 300 of the litter, that really can destroy the enviroment. But let's say 10,000 people go to the river and 2000 litter. Now you've really messed up.

fossil's are like over rated rocks like low key not gonna lie i don't get why we can't just call them old rocks like for real i mean i call my grandpa and grandma that smh

c is the correct answer!