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Answer:
The scientists was able to come to the conclusion that certain organisms have common ancestor because she was able to study and see the skeletal structures of extinct species and compare them with modern day species, and they had a big resemblance.
The skeletal structure is something that needs a lot of time to change, millions of years. Even then, the basics of the structure will be the same, with the further modifications in place on top of it. It is something that is very useful when comparing extinct species and modern day species, as it can give a nice clue about their connection and common ancestry.
The cats for example, the modern day ones and the first ones that appeared, have almost the same bone structure, where even a trained eye finds it hard to find a difference, and that is a very nice clue about tracing the ancestry.
The term evolution refers to the changes that occurred as organisms changed from earliest forms to their present forms. Evolution shows that complex life forms emerged from simple life forms.
The evidence that the scientist observed that led her to believe that certain organisms have a common ancestor is that she observed a fossil with skeletal structures similar to certain modern organisms.
Explanation:
They would likely conclude that certain groups of organisms have the same ancestor after looking at the bones and structure.
What are fossils?
A fossil is a dead preserved remains of the organisms and their bodies are buried in sediments that were formed under ancient lakes and waters.
After looking at the strcture of bines and the scientists can come to the conclusion that these four fossils were of the same species and that they differ from the modern-day ones. Cabon dating and isotopic data can show us the time of origin.
Find out more information about the fossil.
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