You tried going to https://ahva.ubc.ca/correqu.cfm?rem=3445&u=in-order-for-the-thyroid-gland-to-produce-thyroxine, and it doesn't exist. All is not lost! You can search for what you're looking for.
https://ahva.ubc.ca/correqu.cfm?rem=3445&u=in-order-for-the-thyroid-gland-to-produce-thyroxine