“All vertebrates are chordates but all chordates are not vertebrates”. Justify the statement.

All vertebractes are chordates but all chordates are not vertebrate. Explain.

What are the Chordates and non-chordates ?

Biology is the story of life on the earth. Justify the statement.

Frogs are beneficial for mankind, justify the statement.

Mammals are most adapted among the vertebrates. Elaborate.

A: Urochordates and cephalochordates are often called invertebrates chordates R : They are connecting link between invertebrates and the chordates (A) A and R both are correct and R is correct explanation of A. (B) A and R are correct but R is not explanation of A. (C) A is correct and R is false. (D) A and R are false