An ecosystem is self-sustaining as long as organ- isms have sufficient quantities of energy, oxygen, minerals, and water. when organisms die, some of these materials are recycled back to plants in the ecosystem primarily through the activity

1 digestive system

2 stomach

3 bladder

4 carbon deoxide

5 tiger

they both go up but then go back down. they both end lower than they started. lastly, they both are competitive/the second on.

explanation:

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.