Insects aid in decomposition, provide us with food, pollinate plants and condition the soil that we depend on to grow crops. Despite their small size, insects' role in biodiversity is very important. Insects outnumber all other creatures on Earth - both in terms of the number of species and in their population. To visualize the relationship between the species, click on see it below. Humans don't come out on top.
Scientists are unsure exactly what important role every plant or animal plays in the environment.
There are nearly 2 million species of living organisms identified by scientists, but it is estimated that there are probably millions more that have not been discovered yet. But species are going extinct by the thousands before we have a chance to understand what role they play in an ecosystem. Click here to see how humans are speeding up extinction in our world . Insects have already taken over the world. There are currently 6 billion humans on Earth.