Which symbols best describe parasitism?

Which symbols best describe commensalism?

A tick and a dog have this type of relationship.

A tapeworm and a cat have this type of relationship.

Cattle egrets are birds that forage in fields among cattle. The egrets get easy access to food and the cattle don't care if they are there or not.

Red-billed oxpeckers are birds that feed on parasites found on an impala. The impala gets rid of parasites and the red-billed oxpeckers get a yummy dinner. This is an example of _______.

A relationship between two organisms in which one organism benefits and the other is harmed.

A relationship between two organisms in which both organisms benefit. 

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

Mistletoe extracts water and nutrients from the spruce tree to the tree's detriment (harm). 

Yucca flowers are pollinated by yucca moths. The moths lay their eggs  in the flowers where  the larvae hatch and eat some of the developing seeds. Both species benefit.  

A wrasse fish feeds on the parasites found on the black sea bass's body. Both species benefit. 

Silverfish live and hunt with army ants. They share the prey.  They neither help nor harm the ants.