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