I think its Our.
The answer is most likely Our.
Citing a source means to give credit to the source that you got your information
They aerate the soil, pollinate blossoms, and control insect and plant pests. Many insects, especially beetles, are scavengers, feeding on dead animals and fallen trees, thereby recycling nutrients back into the soil. As decomposers, insects help create top soil, the nutrient-rich layer of soil that helps plants grow.
hope this helps (:
