In animals like Annelids, Molluscs, organs have associated to form functional systems, each system concerned with a specific physiological function. This pattern is called ________ system level of organization.
organ
The correct answer is organ system level of organisation.
When organs combine to form functional systems — each carrying out a specific physiological function such as digestion, circulation, respiration, or excretion — the body plan is called the organ-system level. Annelids (e.g., earthworms) and Molluscs (e.g., snails) show this level, as do Arthropods, Echinoderms, and Chordates.
"Open" and "closed" describe circulatory-system types, and "coelom" refers to a body cavity — none describe the overall level of organisation.
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