Final answer:
The use of 'serve' in paragraph 3 and 'service' in paragraph 4 develops the idea of service.
Step-by-step explanation:
The idea of service is developed in paragraph 3 and paragraph 4 of the text.
In paragraph 3, the word 'serve' is used to highlight the idea of serving others or providing assistance. This supports the concept of service.
In paragraph 4, the word 'service' is used to further emphasize the importance of helping others and being of service to the community. It reinforces the idea of serving and giving back.