These are industries that produce goods using resources in the environment
A small business is a self-sustaining organization that is designed to generate revenues or even profits from Day 1. It might not require as much investment and is less risky. However, it also doesn't have a lot of upside.
A startup is akin to a small plant. It doesn't offer any immediate benefits after planting, but just keeps sucking resources. Most plants you try to grow die before they become a tree. However, if it does survive and grows big, it can provide benefits for a long time to come. It can scale by growing vertically and also generate seeds for new child plants.