The two gasses that make up 99% of the earth's atmosphere are nitrogen and oxygen.
Hope that helped! =)
Answer:
Something that can be tested, or rationalized.
Explanation:
You didn't give any statements to choose from, so I'll give you a rule of thumb. When finding a scientific statement, make sure it's something like "The tide is higher at noon than it was at 3 am." and not "Your dog is itchy, so that means a bad storm will arrive."
Answer:
For question 1 the answer is respiratory, and for question 2 is circulatory