A dogs tendency to bark because a dog has to communicate which for them is barking, to get the attention needed.
A because the nervous system gives you sign and how you should be felling so it makes y perspire after you felt as if u were in danger
The answer to the question is nucleic acid glad I could be of help if you need any more help at me and I'll try to help when I can
The answer would be
B.) Nuclear power produces harmful radiation