The word “biodiversity” refers to the variety of life forms that live in the Earth. It includes all living beings with huge genetically and environmental differences; therefore when you compare several types of corn, for example, you observe biodiversity, and when you visit the North American forests or the Brazilian jungles, you are able to appreciate the differences between each of these biomes and the biodiversity they contain.
Scientists estimate that there are between 3 and 30 million of species, but it is possible that this number could reach up to 100 million. At least, there are approximately 2 million species of animals and nearly 8.8 million species that are not bacteria or microorganisms. With these figures, you can imagine the vast amount of living things that are known and those that we do not even realize that exist yet.