Answer:
no it is a chemical that we drnik
Explanation:
I think C because scientific research can make them humans do
<span>4) It can cause air, soil, or water pollution. Those are hazards or risks 1-3 or gains and good things and thats not what the question is asking</span>
The advantageous proteins that build larger molecules help prolong life life. If there is better survival and reproduction, it is more likely to pass onto the next generation. If it continues to be advantageous, the sequence of them change to support the life of the current species.
large surface area,
high CO2 concentration
High blood diffusion (from high to low concentration)
Thin walls adjusted for gaseous exchange.
