Please capitalize where necessary: contributing to the normal functioning of the immune system and protect the body from the harmful effects of free radicals.
A: Contributing to the normal functioning of the immune system and protect the body from the harmful effects of free radicals.
Q: wednesday 23 october at noon, 2,062 people had already registered.

A: Wednesday 23 October at noon, 2,062 people had already registered.
Q: you may have the chance to lead or influence others, so use that influence to help everyone concerned to grow with you.
A: You may have the chance to lead or influence others, so use that influence to help everyone concerned to grow with you.
Problem: throughout its history, humankind has sought the help of mystical symbols (see "symbols and talismans").
Can you repeat this sentence, but capitalize it?
Answer: Throughout its history, humankind has sought the help of mystical symbols (see "Symbols and Talismans").
Text: is a good idea to stroll through the countryside and visit the farmers, they will immediately open its doors, como la mayoría de los cubanos.

Correct capitalization: Is a good idea to stroll through the countryside and visit the farmers, they will immediately open its doors, como la mayoría de los cubanos.
Problem: every british democrat has 9 or 10 slaves working in the colonies.
Can you repeat this sentence, but capitalize it?
Answer:
Every British democrat has 9 or 10 slaves working in the colonies.