Exchange rate. This is the amount of foreign currency that will be generated for every dollar you send. For example, a service might have a rate of 12.48 Mexican pesos per dollar. So if you send $200, it'll convert to 2,496 pesos.
Selenium is a nutrient that the body needs to stay healthy. Selenium is important for reproduction, thyroid gland function, DNA production, and protecting the body from damage caused by free radicals and from infection.
Zinc helps your body make proteins, heal wounds and maintain its immune function, while selenium is an antioxidant that aids in reproduction and thyroid hormone metabolism. Many foods that are rich in zinc are also excellent sources of selenium, and they're also high in protein.