Recalling Interactions among Organisms Identify the interaction described.

✔ commensalism
One species benefits and the other species is neither harmed nor helped.

✔ mutualism
Both species benefit.

✔ parasitism
One species benefits and the other species is harmed.

Humans release carbon dioxide that plants need; plants provide oxygen that humans need.

Tapeworms enter a human’s intestines through contaminated water and steal nutrients from the human.

Remora sharks attach themselves to whales by way of an adhesive disk on their dorsal surface. They then feed on the scraps from the whale’s meals.