The sea slug Pteraeolidia ianthina can harbour living dinoflagellates (photosynthetic protists) in its skin. These endosymbiotic dinoflagellates reproduce quickly enough to maintain their populations. Low populations do not affect the sea slugs very much, but high populations (> 5 × 105 cells/mg of sea slug protein) can promote sea slug survival. 
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?
Definitions:
Predetermined Overhead Rate
A rate calculated at the beginning of a period by dividing estimated total overhead costs by an estimated allocation base, used to assign overhead costs to products or services.
Machine-Hours
An indicator of the amount of work produced or activity level, determined by how many hours equipment is running.
Plantwide Predetermined Overhead Rate
A single overhead rate calculated by dividing total estimated manufacturing overhead costs by an estimated allocation base for the entire factory, often used in simpler costing systems.
Job-Order Costing System
An accounting system that assigns costs to specific jobs or batches of goods, typically used in manufacturing or service industries where each job is unique.
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