an underground river in a Mexican cave
A cave in Mexico was formed as water slowly eroded soft limestone rock. Eventually, so much water collected that there is now a river underground.
The underground river environment is home to shrimp, spiders, and crabs that specialize in living in dark environments. In fact, because these animals don't need to see, some don't have any eyes! For example, species such as the Mexican blind cavefish survive by eating almost any living thing they bump into, including small insects, crustaceans, and bits of plants that float into the cave.
Which of the following best describes an ecosystem in a cave in Mexico?
