used to describe a method of rebuilding wetlands where drainage ditches are blocked and dams built to allow the land to flood.

3

explanation:

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).