Multiple choice

The body organization of Annelida is

  1. tissue grade

  2. cellular grade

  3. organ grade

  4. organ system grade

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Annelids (segmented worms like earthworms) exhibit organ system grade of body organization. They have well-developed organ systems including digestive, circulatory, excretory, and nervous systems with specialized organs working in coordination. This is more advanced than tissue grade (like cnidarians) but represents true organ-system level organization characteristic of complex invertebrates.

Keep practicing — related questions