Most organisms never became fossils
It is impossible to know exactly how many species on earth have antennas. All insects have antennas and although only 900,000 have been recorded most scientists believe there could be as many as 5 million species of insects.
they were first on earth
a compass
There are approximately 1.2 million known species of animals, but scientists estimate there are closer to 8.7 million species on earth. Scientists have only managed to document 14% of living species.
We may possibly know how Earth was created.
Scientists know of about 7,000 species of amphibian. There may be many more living in remote parts of rainforests. Regardless, one person could probably never see all of these species in their lifetime.
By carbon dating minerals, fossils or objects, in the earth.
i dont really know, but i know that it has been looked at by special scientists
not a clue
The answer to your question is unknown to everybody, even the most highly qualified scientists. The reason for this is that there are still some animal species that are unknown. Of course, we can estimate but we will never know for sure, there can always be one more type of animal. Also, Earth is very vague. It would be very hard to calculate the number of anything on Earth, sense there is so much. If you absolutely need and answer, Google how many know species of animals there are, that may help.
The way that scientists conclude that a species is extinct, is that when no one is able to observe any more living members of that species, we arrive at the reasonable conclusion that there are none left.
The nMoon was once a part of the Earth, so it is the same age as the earth.