This lesson discusses ocean acidification, its causes, and the potential dangers that it may pose to aquatic ecosystems by analyzing the relationship between intertidal invertebrates. While focusing on the large issue of ocean acidification, this lesson also provides an introduction to generalized linear models and data visualization using the R programming language while utilizing data from "Ocean acidification alters the response of intertidal snails to a key sea star predator" by Jellison et al. (2016).