Insects eat the leaves of a plant for food. Flowers grow after a summer rain shower. Earthworms loosen soil as they travel through it. Leaves convert sunlight to sugar by photosynthesis.
Which of these is a physical change that takes place in a garden?

Options:
- Insects eat the leaves of a plant for food.
- Flowers grow after a summer rain shower.
- Earthworms loosen soil as they travel through it.
- Leaves convert sunlight to sugar by photosynthesis.

Earthworms loosen soil as they travel through it.