* Both fish and butterflies have bilateral symmetry, meaning that their bodies can be divided into mirror images of each other along a central axis.

* Both fish and butterflies have a segmented body, meaning that their bodies are made up of a series of repeating segments.

* Both fish and butterflies have a single circulatory system, meaning that their blood flows through their body in a single circuit.

* Both fish and butterflies have a respiratory system, meaning that they have a way of taking in oxygen from the environment and expelling carbon dioxide.

* Both fish and butterflies have a digestive system, meaning that they have a way of breaking down food and absorbing nutrients.

* Both fish and butterflies have a nervous system, meaning that they have a way of sensing and responding to their environment.

* Both fish and butterflies have a reproductive system, meaning that they have a way of producing offspring.

Differences:

* Fish live in water, while butterflies live on land.

* Fish have gills, while butterflies have lungs.

* Fish have fins, while butterflies have wings.

* Fish are cold-blooded, while butterflies are warm-blooded.

* Fish lay eggs, while butterflies lay pupae.

* Fish are carnivores or omnivores, while butterflies are herbivores.