Symbiotic relationships

Barnacles create home sites by attaching themselves to whales. This neither harms nor benefits the whales.

• commensalism
• parasitism
• mutualism

Hermit crabs live in shells made and then abandoned by snails. This neither harms nor benefits the snails.

• commensalism
• parasitism
• mutualism

Oxpeckers feed on the ticks found on rhinoceros. Both species benefit.

• commensalism
• parasitism
• mutualism

As buffalos walk through grass, insects become active and are seen and eaten by cowbirds. This neither harms nor benefits the buffalo.

• commensalism
• parasitism
• mutualism

A flea feeds on a mouse's blood.

• commensalism
• parasitism
• mutualism

Hookworms enter the human body by burrowing into the skin of the feet. Once in the skin they enter the bloodstream and travel to the small intestine where they attach to the walls and begin to drink the person's blood and weaken the victim.

• parasitism
• mutualism
• commensalim

Types of orchids grow high on the branches of the tall kapok trees of the jungle. This adaptation allows the orchid to get to the light. The tree is not harmed.

• parasitism
• commensalism
• mutualism

The otters help the kelp by eating the sea urchins which consume the kelp endangering it. The kelp provides an anchor for the otter to wrap around themselves while they sleep.

• parasitism
• commensalism
• mutualism

Which symbols best describe mutualism?

• +,+
• +,-
• +,0
• -,0

A tick and a dog have this type of relationship.

• mutualism
• commensalism
• neutralism
• parasitism