Fill in the blank with an appropriate option. Earwax is a helpful and ______ part of your body's defenses.

natural

The correct option to fill in the blank is natural.

• Transparent does not make sense in this context, as earwax is not transparent.
• Flowing does not make sense in this context, as earwax is not a liquid.
• Tedious does not make sense in this context, as earwax is not a boring or tiresome substance.
• Natural is the most appropriate option, as earwax is a naturally occurring substance that helps to protect the ears.