Unsurprisingly, mammals (not just humans) also fear death and are very distressed when being lead to slaughter and seeing their peers go down before them.
Applies to all living organisms
(Not doubting the chicken nuggets, just wondering about the lower/simpler end of the scale.)
Certain species go the other way probably and become more like a super organism but mammals seem quite individualized compared to ants for example.
While plants may not fear in the manner that we do, they can chemically signal when one becomes damaged or stressed and cause physiological changes in plants that are not sharing the same conditions.