What are 7 levels of classifications a starfish?

You're asking for the taxonomic classification of a starfish. Here's a breakdown of the 7 levels, using the common starfish (Asterias rubens) as an example:

1. Domain: Eukarya - Organisms with cells containing a nucleus

2. Kingdom: Animalia - Multicellular organisms that are heterotrophic (cannot produce their own food)

3. Phylum: Echinodermata - Marine invertebrates with radial symmetry, a water vascular system, and a spiny skin (e.g., sea urchins, sea cucumbers)

4. Class: Asteroidea - Starfish (sea stars) with five or more arms radiating from a central disk

5. Order: Forcipulatida - Starfish with pedicellariae (pincer-like structures) on their skin

6. Family: Asteriidae - Common starfish with a variety of species, including the common starfish

7. Genus: Asterias - The genus that includes the common starfish

8. Species: Asterias rubens - The scientific name for the common starfish

Let me know if you have any other questions!