A trout finds food near the top of a river. It wants to find a safe place deeper under water to eat the meal. How does the swim bladder help the trout get to deeper waters?

When the bladder is completely deflated, the fish has minimum volume and sinks to the ocean floor

The trout can get to deeper water by transferring gas from the swim bladder to its blood. When gas is transferred out of the swim bladder, it deflates, allowing the fish to sink deeper in the water.

Explanation:

Sample answer

the trilobite is used as an index fossil for various geologic time periods as specific types of the trilobites were present in different geological time periods. they are a group of marine arthropods belonging to the class of trilobita.

explanation:

i'm pretty sure it's spores