If prejudice and discrimination continue in society, we will face many setbacks. The unity of people helps bring about change and innovation, but separation will weaken humans across the world. Those unfairly targeted will band together for strength and will do what is needed to make their voices heard through protests, strikes, or other actions. These events will either speed up necessary change or will create further division amongst people. Division amongst groups such as states, countries, or even the world makes us vulnerable to issues, as we cannot work together and fix things. We must unite people before we can expect them to fight side by side.
Either add the passage with the question so we know what you are referring to or do not post questions like these. Not everybody has read what you have. This question is completely useless and unanswerable without the story to go off of.
The crawler, Indexing, Storage, Results are some functions of trains