Answer the following question: Q: Because plants lack what kind of system, their first line of defense is usually the death of cells surrounding infected tissue to prevent spread of infection? Read this paragraph and choose the correct option from the provided answers: Plants don't have an immune system, but they do respond to disease. Typically, their first line of defense is the death of cells surrounding infected tissue. This prevents the infection from spreading. Choices: - nervous system - digestion system - hormones system - immune system A:
Answer:
immune system