A small crab will make its home inside a mussel, obtaining food and shelter while the mussel simply tolerates the situation. In contrast, a different crab falls victim to an intruder who slowly extracts nutrients from its body by spreading a fungus-like substance throughout its extremities. Which TWO symbiotic relationships are described in the examples?
Commensalism and parasitism
Communism and predation
Competition and mutualism
Competition and symbiosis