Here's how you can match each scenario with the correct level of ecology:
1. Ants making their home in a tree - Community (ants are interacting with other species and their environment)
2. Snake burrowing in soft sand to catch a rabbit - Organism (focuses on the individual snake's behavior)
3. A tadpole turning into a frog - Organism (follows the development of a single organism)
4. A group of whales singing to each other - Population (refers to a group of the same species, whales, interacting with one another)