I believe all of the above!
Answer:
only helium makes balloons go up so the answer is helium
Explanation:
Answer:
Moist walls - gases dissolve in the moisture helping them to pass across the gas exchange surface. Permeable walls - allow gases to pass through. Extensive blood supply - ensuring oxygen rich blood is taken away from the lungs and carbon dioxide rich blood is taken to the lungs.
There would be one RR and two Rr and there would be only one rr so it would be 25% of a white flower
