it would be a reptile.. im guessing. there are no words in a box to be circled i am only guessing that could be an option
#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.
Answer:
<em>Natural resources are materials from the Earth that are used to support life and meet people's needs... Examples - oil, coal, sand.. Etc</em>
Hope this is going to help you.
