Histamine, leukotrienes, prostaglandins, and bradykinin are examples of which of the following?
chemical mediators primarily found in the digestive system
chemical mediators that promote inflammation
antimicrobial peptides found on the skin
complement proteins that form macs

Option (2).

Explanation:

Inflammation may be defined as the natural process that helps the body to defend and helps in healing of the body. The production of white blood cells increases at the time of inflammation.

Leukotrienes, histamine, bradykinin and  prostaglandins are the chemicals that mediate inflammation process. These chemicals increases the production of immune cells and causes redness, heat and swelling in the body.

Thus, the correct answer is option (2).

more words for this could be abiotic and biotic

abiotic: living organisms within an ecosystem

biotic: non-living organisms within an ecosystem