Why are there many types of creatures on the earth ?

Just why some groups contain large numbers of species while others don't has long puzzled biologists. One of the main explanations has been geological age - older groups of organisms are more diverse because they have simply had more time to accumulate greater numbers of species.

Among all animals, ants outweigh us in biomass — putting billions and billions of tons up against humans' fewer than 500 million. And while they're both tiny and lacking a backbone, krill are the champs among animals worldwide, in terms of numbers, with a population estimated at 500 trillion.

FUN FACT:

7.827 billion

As of October 27, 2020, the world's human population is estimated to be 7.827 billion.

Explanation:

Brainliest?

In all the time humans have been discovering and describing new species, we've probably only covered about a fifth of what's out there. A study in 2011 predicted there are some 8.7 million species on Earth, and we've identified maybe 1.6 million of them. Just why some groups contain large numbers of species while others don't has long puzzled biologists. One of the main explanations has been geological age - older groups of organisms are more diverse because they have simply had more time to accumulate greater numbers of species.

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