Which tools can be used for tracing the evolutionary relationship…

Question

Which tools can be used for tracing the evolutionary relationships of human evolution?

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Answer

By studying their structural design: Homologous or anologous. It can give evidences of common ancestor. Forelimbs of humans and wings of birds look different externally. However, their skeletal structure is similar. Thus, their origin is similar, but functions are different. While wings help a bird in flight, the forearm helps human beings in various activities. These structures are called homologous organs.
By the study of fossils: A million years later, some dinosaurs died at the same place with their bodies getting buried on top of the sedimentary rock. As a result, the mud, containing the dinosaurs, also turned into rock. Now, if that area is excavated deeper, dinosaur and invertebrate fossils can also be found.
Comparing the DNA of different organisms: All species have the same genetic code. So we can trace some evolutionary relationship among the species.

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Experiment No.	Set up details
1	2 iron nails in a cork capped test tube + Tap water immersing the nails +
2	2 iron nails in a cork capped test tube + Boiled water immersing the nails + Oil on top of water layer.
3	2 iron nails In a cork capped test tube + Cotton wool on top of the iron nails + Granules of calcium chloride on cotton wool.

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