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its beacuse there are millions of species in the world, and there are still mooooore speacies we still dont know about. its impossible to study all of them it will take a great amount of time to discover and study them.but, the most mysterious place is the ocean we know more about space than we know about the ocean. the ocean is sooo HUUUUUGGGGGE and  massive it covers 70% of the world, imagine how many species will be in a place that covers 70% we still dont know about.

~batmans wife dun dun dun....

adefioyelaoye

Estimating the number of species on Earth so difficult due to man not

discovering all the species on earth yet.

There is a large amount of species yet to be discovered by scientists due to

how big the earth is. The earth comprises of the land and various water

bodies. Most discoveries have been with land organisms as that is where we

live.

In water bodies such as seas, oceans there are many species yet to discover

as they are very large and humans don't live in it giving rise to less

discoveries.

Read more on https://brainly.com/question/17354219

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