The largest level of organization in living things is a(n) (2 points) organism organ tissue cell

Organism. 

You are an organism for example.

Your heart is an organ, so that's clearly smaller than you. 

Your heart is made of muscle tissues, so that's smaller than your heart. 

And those muscle tissues are made of cells, so that's smaller than the muscle tissues of your heart. 

Closing a ring restricts the rotation around individual car bon carbon bonds hope it will you !