Question

Why are human beings Who look so different from each other in terms of size, colour and looks said to belong to the same species? ​

Answer 1

Answer:

Human beings though different in size, colour and looks, belong to the same species because:

1. They have similarities in the DNA sequences

2. They have descended from the same ancestor

3. They can reproduce among themselves.

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Answer 2

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1. Human evolution has been studied by using the various tools of tracing evolutionary relationships like excavating,carbon-dating,studying fossils and determining DNA sequences.

2. The human races were even identified on the basis of their skin colour and named as qhit,black,yellow,brown. It is known that the so called human races have not evolved differently.

3. In fact,there is no biological basis for dividing human beings into different races. All human beings are single species.

4. It has now been established by research that the earliest members of human species came from africa.

5. About hundred thousand years ago,some of our ancestors left Africa while others stayed back. Those who left africa slowly spread across the whole earth.

Darwin's theory of evolution tells us how organisms develop from simple to more complex forms.According to this theory,we can say that All the human beings who are living now have evolved from the humans who have earlier lived in africa.