Answer the following question given this paragraph: 

The majority of arthropods are insects (Class Insecta). In fact, more than half of all known organisms are insects. There may be more than 10 million insect species in the world, although most of them have not yet been identified. In terms of their numbers and diversity, insects clearly are the dominant animals in the world.


Q: More than half of all known organisms are what?

 Choices:

- mammals

- enzymes

- spiders

- insects

A:
insects
