Answer:Argon is the third noble gas, in period 8, and it makes up about 1% of the Earth's atmosphere.
Explanation: because ik trust me lmk if im right and give my brainliest answer and likes plz
Answer:
YEP!
Explanation:
The answer to the first question is mucous membranes and skin
The answer to the second question is All of the above
Hope this helps! Good luck ;)