Molecules only move across the blood - air barrier if there is a difference in concentration.
So I think that nothing would happen!
It should be natural selection since there is no external influence implied. (like environment or genetic mutations.)
Answer:
C.) Species
Explanation:
Since you mentioned classifications for animals, the answer would not be families. Genus is a more general classification for animals and groups aren't even part of the classification for animals, so that would leave us with one answer, species.
Hope this helps ya :D
José probably doesn't feel any pain because his body, during and after exercise released endorphins which are endogenous opioids. This endorphins promote a sense of satisfaction and pleasure, and make pain and discomfort feel irrelevant.
Lichens and algae I believe
