secondary succesion takes place
Answer:
most likely d, she's a chemist so she works with chemicals and substances akin to them
Answer:
Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
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I think that’s substitution