Upwards to the trillions.
about 40 million species are estimated to live on earth
There are many species of horses that are alive and inhabit the Earth today. There are domesticated horses that are well taken care of, and feral horses that roam the Earth, there is an estimated 59,000,000 horses in the world.
Microbes were the first organisms to inhabit earth. They are single-cell organisms like bacteria, fungi and protozoa
No, he recognised that species evolve into new species.
No. The term species denotes a very specific group of organisms. It is estimated that the average extinction rate on Earth is roughly one species per year. Currently it is much higher.
Scientists believe there are around 8.7 millions species on Earth, but this number could be off by 1.3 million either way. It is estimated there are 6.5 million land species and 2.2 species in the oceans.
The largest numbers of species of organisms on the earth are currently bacteria. They out number plants and animals by far.
3 to 30 million .