r2b2ndjyq5 r2b2ndjyq5

12-08-2021
Biology

contestada

What maintains the concentration gradient across
respiration membranes?
A. Ventilation
B. Cartilage
C. Spiracles
D. Cohesion

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kierrawillis2323 kierrawillis2323

12-08-2021

spiracles which is c

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