|Fallen plant leaves will decompose into ____.
|A fox is a rabbit's predator. A rabbit is a fox's ____.
|A ____ is a group of organisms of the same species.
|Any substance used to kill unwanted plants is a ____.
|The ____ is the sum of all the Earth's ecosystems.
|A predator kills its prey. A ____ feeds on dead animals.
|A ____ is a composite organism composed of a fungus and algae.
|The place where an organism lives is its ____.