Which is a biological stressor, impacting some coral reefs?

Sedimentation has been identified as a primary stressor for the existence and recovery of coral species and their habitats. Sediment deposited onto reefs can smother corals and interfere with their ability to feed, grow, and reproduce.

one would be wind another would be water density

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;