The BRAIN. All of the senses send message to the Brain
I think it’s D, carbohydrates.
Answer: The cell wall
Explanation: The cell wall resists overexpansion as the cell swells with water.
I think you forgot to give the options along with the question. i am answering the question based on my knowledge and research. "One group of bears was less highly evolved less than the two other groups and was destined to die out" is the one that explains why only one group of bears were extinct. I hope the answer has helped you.