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Q: Is it true that 99.5 percent of all species that have ever existed have become exstint?
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What percent of endangered species end up extinct?

It can be assumed that, eventually, 99.9% of endangered species will end up extinct. This is because, according to scientists, 99.9% of species that have ever existed on the Earth have become extinct.See the related link for more information.


What percent of species that existed on earth have gone extinct?

It is estimated that 99% of all animals that have ever lived are now extinct.


How many animals are excinct?

It is hard to determine exactly how many animal species are extinct because some species become extinct before scientists even know they existed. As far as science can tell, there are over 900 extinct species.


How many species have gone extinct since 1681?

It is hard to calculate the number of animals that have become extinct since 1681 since some species went extinct before scientists knew they existed. What is known is that more than 90 species of birds and hundreds of species of mammals have gone extinct since then.


How did the basilosaurus become existed?

Aids...


When a species dies out what does it become?

When the last living member of that species dies, the species become "extinct".


why has this species become dangered?

Depends on the species


Two species have the same niche. What is the most likely outcome when one species is the superior competitor?

The other species will become extinct


How does an unknown species become a known species?

When Someone finds it.


When some members of a species become isolated they are less likely to become a new species true or false?

False.


What does 1.46 percent become when expressed as a percent?

1.46 percent is expressed as 1.46%.


How do scientists know that KT extinction took place?

When we see that there are fossils found in a certain geological layer, which are evidence that a certain species existed at that time, and then in the next geological stratum we no longer find those fossils, and there is no evidence that the species which used to exist still exists, we infer that the species became extinct. If a whole lot of species become extinct at approximately the same time, we call that an extinction event, such as the KT extinction.