In what ways might individuals of the same species compete with each other if they are

(a) herbivores
(b) carnivores
(c) producers

2 answers

a) herbivores all eat plants so if there are lots and lots of rabbits and a very little vegetable garden plot they may have to move on to find more food, or go hungry.
b) carnivores are meat eaters. Take for instance deers and wolves that live on an island. The wolves eat all the deer, then the wolves die off due to starvation, then the few few few remaining deer repopulate the island.
c) producers are things such as algae...
Thanks