Answer:
B because aveoli are part of the lung Branch and capillaries take in the oxygen with blood?
Explanation: my guess since carbon dioxide also needs to be excreted out of lungs.
Sorry if this isn’t right but I believe it’s Protista
<span>The mineral crystals in obsidian are too small to see without a microscope. This is because the rock cools so rapidly from magma that crystals barely have time to form. Obsidian is a normally happening volcanic glass framed as an extrusive molten shake. It is delivered when felsic magma expelled from a well of lava cools quickly with negligible precious stone development.</span>
