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Actually, there are a variety of methods to know about the existence of different species. In some cases, scientists rely on past writings from respected men and women who had discussed those species. In other cases, as modern biologists, entomologists, oceanographers, and others make interesting new discoveries, they want to determine links to past species or find out how old a particular discovery really is. A common technique is to use carbon dating to determine how old a species is/was. Some scientists do extensive research on the history of a given species, looking at what information exists about it and what new information has been published. There are new species being discovered on a regular basis, and I enclose a link to a publication that follows these discoveries.
Wiki User
∙ 11y ago
Wiki User
∙ 12y agoif your talking about if they know are there species on planets then it is becuase there would be water on that planet and if your talking about if it is from the dinosaur times and stuff then it is because they would excavate things (dig things up) to find fossils and old things to do with them.
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How much do scientists know about genes?
We so know what genes people have, and we know what genes many other species have. We also know what some of these genes do, and we even know in some cases how they do it. But there is a great deal that we don't know. At a guess, we only know 1% of the full explanation of what genes do and how they do it.
How did scientists know that oxygen was a new element?
scientists knew that oxygen was a element as it had the atoms of only O i,e. oxygen and helped in increase in combustion
How do scientists know that a new theory is accurate?
Because all of the observations and evidence are used for support.
Scientists hypothesize that life may have existed once on what planets?
Yes, demonstrably the planet Earth has life. Scientists are currently looking for life on Mars (no proof of life recognized there yet) and are speculation that some extrasolar planets may be in the Goldilocks zone for life.
Is everything scientists say true?
No not always! Scientists make mistakes just like regular people. So don't belive everything they say because everything they say isn't true! If scientists said if you touch a person with your eyes closed and they turn purple right away would you believe it? No of course not. Scientists don't know everything only God does.
How many dinosaurs are the re?
Scientists have discovered about 1,000 species of dinosaur, divided among about 500 genera. This is probably only a fraction of the number of dinosaur species that existed. It also doesn't account for 10,000 living bird species, which are technically dinosaurs.
How do scientists make endangered animals not extinct?
scientists are trying to save the endangered species , by just making the people aware of the animals. scientists can save the endangered animals only if they come to know that how to make an animal from it's DNA. if this happens only if it can,,, the extinct species like the dodo can become alive again.
Was pangaea the only supercontinent that ever existed?
Scientists believe there were several other supercontinents before Pangaea.
How many species on Earth have antennas?
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.
How much do scientists know about genes?
We so know what genes people have, and we know what genes many other species have. We also know what some of these genes do, and we even know in some cases how they do it. But there is a great deal that we don't know. At a guess, we only know 1% of the full explanation of what genes do and how they do it.
How many kinds of animals are their?
In all there are about 3 million species scientists have found but scientists also estimate they have only found about 30% of all the types on Earth.
Is the Megalodon still live in 2011?
The Megalondon is an extinct species of shark that died off over one million years ago. Only fossil records are found today. This fossil evidence is the only reason we know that these creatures every existed.
What were scientists surprised to discover during their research for the Human Genome Project?
Humanity has only a 0.1% variation as a species.
Why are there both males and females?
In terms of biology, there are both females and males of a species in order to breed and create more of the species. If only one of the sexes existed, the species would end when the last of it's kind died.
What do scientists think existed before the formation of the universe?
"Scientists think" that there is no such thing as "before", because the big bang was the beginning of time as well as space. Yes, I agree with you. I don't understand it either. I'm only telling you what I have read.
How many animals' are there in the world?
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.
How do scientists know some animals can only see in black and white?
look
