The ecosystem shown in the diagram above is composed of

1) The living organisms interacting together

2) The living organisms interacting together with the other biotic components.

3) The living things interacting with each other and the abiotic components.

4) The living Thing interacting with the dead things.


Which pH value indicates the most acidic condition?

A) 1.6

B) 2.1

C) 7.3

D) 11.1