<span>The correct answer is b.0.5 to 1 micrometre thick.</span>
Usually, the respiratory membrane is about 0.6 micrometres thick. This membrane consists of the alveolar epithelial cells, the capillary endothelial cell, and basement membranes which are formed by the alveolar and capillary cells.
A seals flippers has finger bones when a birds wing is just a bone connected to other joints.
Answer:
D
Explanation:
Because every system in the body is vital
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