Which of the following choices is an example of a non-specific barrier? skin
white blood cells
lymphatic system
the immune system

Lymphatic system. I think

Ifound this on google “aristotle (384–322 bc) in western scientific taxonomy the greek philosopher aristotle was the first to classify all living things, and some of his groups are still used today, like the vertebrates and invertebrates, which he called animals with blood and without blood.” i hope this you for what your looking for.