Percent of Sea Slug Respiratory Carbon Demand Provided by Indwelling

Multiple Choice

Percent of sea slug respiratory carbon demand provided by indwelling dinoflagellates.
-According to the graph, during which season(s) of the year is the relationship between the sea slug and its dinoflagellates closest to being commensal?

A) winter
B) spring
C) summer
D) fall
E) spring and fall