large surface area,
high CO2 concentration
High blood diffusion (from high to low concentration)
Thin walls adjusted for gaseous exchange.
the answer is d hope this helps
Cell devision has three main purposes; repairing the organism, reproduction and growth. Repairing the organism is important because it will allow the organism to survive longer. Reproduction is important because it allows the species of organism to live and survive longer. Growth is important because it allows the organism to grow larger and stronger.
