Why do you think adult male crabs have such a large claw? What could be the purpose of it? And can you think of any other animals that have structures with a similar purpose?

cause they use the small one for feeding and the large one to attract a female crab for mating, the large claws are also used as a weapon

answer; /// the correct )

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%