Answer:
the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution.
The best and most correct answer provided by the question is HBr, the most powerful and dangerous acid. I hope my answer has come to your help. hope this helps and have a nice day!
I think the respiratory system and circulatory system
