Answer:
I'm not writing your paragraph for you, but I'll give you some help on it.
Step-by-step explanation:
2 animals that will compete are ants
they are constantly fighting for new territory
What happens, is that when the attackers come, the scouts for the defenders spray something (I forget what) into the air. This alerts the more heavily armed troops nearby. If the defenders win, the attacks are driven back to their colony. If the attackers win, the ants in the defending colony are either overrun and killed, or they run. If the attackers win, they find all the larvae in the nest and either kill them to stop the line together, or in some cases, eat them.
Hope this helps.