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Which organ system is not primarily involved in external exchange?a. respiratoryb. digestivec. urinaryd. circulatory

User Coomie
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Answer: D. Circulatory

Step-by-step explanation:

Respiratory:

You breathe oxygen in and release other gasses out.

Digestive:

You eventually excrete what you ate.

Urinary:

You eventually urinate the fluids you intake.

User DeadChex
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