hairs on the back stand up when scared decreased heart rate when sleeping movement of waste into the bladder temperature increases during an infection
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of these is a response of cats to external stimuli?
Possibilities:
- hairs on the back stand up when scared
- decreased heart rate when sleeping
- movement of waste into the bladder
- temperature increases during an infection

hairs on the back stand up when scared