Why is a jellyfish nekton?

Here's why:

* Nekton are organisms that actively swim in the water column. They have the ability to move independently against currents. Think of fish, whales, squid, etc.

* Zooplankton are drifting organisms that are carried by currents. They may have limited swimming abilities, but they don't have the strength to actively swim against currents.

Jellyfish rely on currents to move them around. While they can contract their bodies to propel themselves short distances, they don't have the powerful musculature needed to be classified as nekton.

It's important to remember that there's a bit of a grey area between these categories, and some organisms might fall somewhere in between. However, in general, jellyfish are considered zooplankton.