How are starfish and horses different?

Starfish and horses are very different animals, belonging to entirely different categories of life:

Starfish:

* Phylum: Echinodermata

* Class: Asteroidea

* Invertebrates: Lack a backbone and internal skeleton

* Marine: Live in salt water

* Radial symmetry: Body parts arranged around a central point

* Regeneration: Can regrow lost limbs

* Feed on: Mollusks, barnacles, and other small animals

* Reproduction: External fertilization; release sperm and eggs into the water

Horses:

* Phylum: Chordata

* Class: Mammalia

* Vertebrates: Have a backbone and internal skeleton

* Terrestrial: Live on land

* Bilateral symmetry: Body parts arranged symmetrically on both sides of a central axis

* Reproduction: Internal fertilization; give birth to live young

* Feed on: Grasses, hay, grains

* Domesticated: Used for riding, transportation, and other purposes

Here's a table summarizing some key differences:

| Feature | Starfish | Horse |

|---|---|---|

| Phylum | Echinodermata | Chordata |

| Class | Asteroidea | Mammalia |

| Backbone | No | Yes |

| Habitat | Marine | Terrestrial |

| Symmetry | Radial | Bilateral |

| Reproduction | External fertilization | Internal fertilization |

| Diet | Mollusks, barnacles, etc. | Grasses, hay, grains |

| Movement | Using tube feet | Walking on four legs |

As you can see, these animals are vastly different in their anatomy, physiology, and lifestyle.