micaelalopez1204 micaelalopez1204

20-04-2021
Biology

contestada

PLEASE HELP!!
Which of these is necessary for gas exchange in the respiratory system?
a.At least 30% oxygen in the air
b.The exchange surface must be moist c.The air must be cooler than body temperature
d.The blood cannot be moving

Respuesta :

Asiaunique Asiaunique

20-04-2021

Most likely A only because your respiratory system needs oxygen

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