Answer:
A) Not all defenses are effective against all natural enemies.
Step-by-step explanation:
Animals have natural enemies that threaten their survival. These enemies may be microorganisms, or preparers who hunt their natural enemies for food, territory, and other things. Animals seek production tactics against these enemy attacks, these tactics are eventually effective, but often animals fail to use these tactics against all natural enemies and end up caught. For this reason, we can say that what can help explain why all organisms do not defend themselves against all natural enemies is that not all defenses are effective against all natural enemies.
We can use as an example the excavation that some rodents make to escape from natural enemies like birds of prey and other animals. However, digging is not an effective defense tactic to rid snake rodents, who may find their hiding place more easily due to their moving habit.