There are encountless animals that live in the present and that lived in the past. It maybe so that scientists have not found the remains of some animals that lived in the past.
Scientists haven't identified all the species that are alive today because different species are emerging ("being made") all the time.
Scientists estimate that there are more then 9,000 species of Cnidarians identified.
1.4 million species have been identified so far.
Because nobody has found them or seen them yet
Scientists can learn more about ancestors of different species and organisms by looking at fossil records and observing related species that are alive today.
nobody brought AIDS here.The virus has been here for years it is just that our scientist and doctors havent descovered it then or the methods they used then wont as advanced as these of today.
No it havent
Carl Linnaeus
The scientist who assigned every organism a genus and species name is Carl Linnaeus. He is known as the father of modern taxonomy and developed the binomial nomenclature system, which is still used today to uniquely name and classify organisms based on their genus and species.
Robert Hook. He didn't actually see the cells as we know of it today, but identified the magnification of cork as "cell", because it looked like prison blocks.
they havent died yet because they are still living today.
There are hundreds of thousands of species living today.
There are around 10,000 living species according to scientist's estimates, making them the most varied tetrapod (having four appendages) vertebrates. Not all these species are described and the exact number is impossible to estimate because there is no clear cut definition of a species. Taxonomists are constantly redefining species and subspecies.