Planting the small saplings in the substrate of the ground allowed these plants to take in nutrients to grow bigger.

So that the lizard could live comfortably, the boy used a mixture of sand and clay dirt as the substrate in the bottom of the aquarium.

Even though nothing was living in the terrarium, the scientist packed a layer of dirt and moss for the substrate.

Bird cages are typically lined with newspaper for the substrate since it is easy to clean and is accessible.

Mushrooms grew plentiful in the forest due to the nutrient-rich substrate located below the sprigs of grass.