Mention the two principles through which Lamarck explained his ideas.

Name any three vestigial organs found in humans.

Tick mark (√) the correct option in the following statements.

(a) The fossil history of humans is complete/fragmentary.

(b) The first remarkable human fossil was that of H. habilis/H. africanus.

(c) Evolution is an ever continuing/promptly ending process.

Define the following terms:

(a) Evolution

(b) Vestigial organs

(c) Speciation

(d) Bipedalism

(e) Natural selection