18. Seema learns every lesson very quickly, but Leena takes longer to learn them. It denotes the developmental principle of
(1) continuity
(2) general to specific
(3) individual differences
(4) interrelationships
Ans-(3) There are no fixed rate of development. All children will learn to speak is universal but the time at which age child start speaking properly may vary. This is known as the principle of individual differences.