Okay kiddo, so a natural growth promoter is something that helps plants or animals grow bigger and stronger without using any chemicals or artificial stuff.
Imagine you have a garden where you plant some vegetables. In order for them to grow healthy, they need water, air, and nutrients from the soil. Natural growth promoters are things that can give those nutrients to the plants.
For example, some farmers use things like manure (poop from animals) or compost (decaying plants) to help their crops grow. These things have lots of nutrients like nitrogen, phosphorus, and potassium that plants need to grow.
Another example is honey. Some beekeepers use honey to help their bees grow stronger and healthier. Honey has vitamins and minerals that help the bees stay healthy and grow bigger.
So basically, a natural growth promoter is just something that helps living things grow naturally without using any chemicals or artificial stuff. It's like giving plants or animals a healthy diet!