Predation
Competition
Mutualism
Commensalism
Parasitism
Scavenging
Competition
Herbivory
Amensalism
Coevolution
25.
21. Goat eating grass
22. Orchids growing on the branches of a tree
23. A heron eating the ticks from the back of a car
24. Butterfly sipping nectar of a flower
Eagle preying on a snake
26. Ornamental grasses and day lilies
27. Barnacles on a turtle's shell
Aphids and ants on a branch of a tree
29. Lice on human hair
30. Tapeworms in human
28.​