Not sure i remember this but i think radius is like half of the diameter. it’s a line from the center, to a side of the circle. in this situation, line RO would be representing the radius.
answer: D, line RO
hope this helps :)
air sacs or alveoli the lungs and blood 3 transport
of respiratory gases
Answer:
this makes no sense but i already answered so ima say 1
Step-by-step explanation:
im so sorry