Give an example of each type of ecological relationship: mutualism parasitism commensalism predation competition

Mutualism: The bee and the flower. Bees fly from flower to flower gathering nectar, which they make into food, benefiting the bees. When they land in a flower, the bees get some pollen on their bodies, and when they land in the next flower, some of the pollen from the first one rubs off, pollinating the plant. This benefits the plants. 
Parasitism: Fleas and dogs. Fleas harm their hosts, such as dogs, by biting their skin, sucking their blood, and causing them to itch. 
Commensalism: The relationship between cattle egrets and cattle.The cattle egret will eat insects that have been disturbed when the cattle forage. One species benefits while the other neither benefits or are harmed.
Predation: The relationship between lions and zebras. The predator, the lion, kills and feeds on the prey, the zebra.
Competition: One example of competition between two organisms would be chipmunks and squirrels. They compete for nuts to be able to feed themselves and survive.

The answer is option e. it protects the heart and lungs.