Answer:
They adapted with new traits to survive to new environments.
Explanation:
survival of the fittest
When a Stickleback fish feels threatened, it will flare out its pair of pelvic spines and three dorsal spines, making it difficult for predators to swallow them.
Answer:
cellular respiration...that's breathing out of humans
and through human activities like burning of fossil fuels...
Yes, your ear canal is connected to your brain.
