What to describe there's no picture
This n that description
they are pronouns,n they are a part of grammer
The respiratory system brings air into the lungs supplying the blood with oxygen. Oxygen is carried throughout the body to the organs and keeps the heart pumping and when the blood circulates back to the lungs the process starts over again.
Answer:
C. Concentration gradient
I think the answer would be 420hg=4,200,000cg
Answer:
Atoms and molicules
Explanation:
Positive, negative, and nutrol atoms mix together and make up everything
the world and that also includes making living things.
