Final answer:
Removing the garden would disrupt the food chain, affecting the snails, birds, and household cat. The snails and birds would need to find alternative food sources or potentially migrate, while the cat might need to hunt other prey.
Step-by-step explanation:
When the garden is removed, it would disrupt the food chain. The snails would lose their source of food and might have to migrate to find a new food source. The birds, which rely on snails as their primary food source, would also be affected. Without snails, they would need to find alternative sources of food or potentially migrate as well. The household cat, being at the top of the food chain, might be able to adapt by hunting other prey, such as rodents or insects, but its population might still be impacted due to the decrease in available prey.