I'll do four!
🪼 There are thousands upon thousands of shrimp species worldwide, of which around a couple hundred are edible iirc.
Certain orders of crustaceans are still debated upon being shrimp, while others outside of those are still called such. Ceridean shrimp are often called "true shrimp," as there is no debate.
Sea turtles are able to eat jellyfish due to spiky papillae, which cats also have! (That weird sandpaper feeling when cats lick you.) The spines are made of keratin and protect the turtle from stings, as well as their shells and scales.
Both jellyfish, corals, and sea anemones belong to the phylum Cnidaria, so they are all related. Though jellyfish belong to the class Scyphozoa, while corals and anemones belong to Anthozoa, making them of different taxonomies.