#1 is CO2 exchange. CO2 is diffusing from the blood into the alveoli for expiration.
#2 is O2 exchange. O2 is diffusing from the alveoli into the blood to be carried to the tissues.
D the formation of specicies
<span>A composite body in this section refers to a body made of a </span> collection of “simple” shaped parts or holes.
Answer:
The four main ways are freeze-thaw, onion skin (exfoliation), chemical and biological weathering.
Explanation:
The whole human body is a lever system, that's how muscle work. Your joins are the fulcrum, your muscle contracts and hence is the effort. On the other side, whatever you're holding and the weight of your hand is the load. There are all 3 classes of lever system in your body.
