Group 18 non reactive and non metallic
B. Segregation.
I have the same question and answered it and this is what it told me. I think it should be right.
Extinct is correct. When no members of a species remain, the species is said to be extinct.
The fight or flight response is most likely because of stress as this response usually occurs or happens when an individual is experiencing stress and when he or she is likely exposed to stimulus that will result the person to feel stressed and worn out.
Answer: Excretory
Explanation: My grandpa went through this recently and I had to learn all about it. :(