What would happen without excretory systems in humans? ?

What are three characteristics of positive self esteem?

1. true or false decay destroys tooth enamel 2. true or false- tooth decay starts when plaque builds up on your teeth

Which is one way that sinkholes can form? a) tornadoes touch down and destroy trees and brush b) rivera overflow during a storm and wash away nearby land c) rainwater flows away from a depression in the ground d) groundwater dissolves the limestone and other rocks in the ground