JAMB - Biology (1988 - No. 6)
Which of the following sets of organisms represents the correct trends from simple to complex structural organization? 1. Mollusca 2. Platyhelminthes 3. Nematoda 4. Protozoa
4 → 1 → 2 → 3
4 → 3 → 2 → 1
4 → 2 → 1 → 3
4 → 2 → 3 → 1