Answer:
There are millions of insects species and every day we find more. Scientist say that insects make up over 60% of all species on Earth.
If so, that could be anything from six to twelve million individual species and that figure is a moving target. The ultimate adapter, insects can quickly evolve into new species dependant on conditions and habitat.
Even Humans are responsible for the evolution of some types of insects. Without humans the human bed bug or head louse would not exist.