Moth larvae eats leaves of the plant. It is an herbivore, a primary consumer in food chain. The primary consumer occupies the second trophic level in owl's ecosystem. The moth larvae in turn is eaten by small bird, a secondary consumer. Thus small bird occupies the third trophic level. Small bird is eaten by an owl, a top consumer that occupies fourth trophic level.
He developed and proposed a theory about evolution. Which is humans and animals changing to suit their environment over years
+/+ = mutualism
+/0 = commensalism
+/- = parasitism or predation
