Select the main groups of arthropods.Multiple select question.trilobitesannelidscheliceratescephalopodspolychaetesmandibulates

To select the main groups of arthropods from the provided options, we should consider the classification of these groups in the context of arthropods. The relevant groups are:

1. Chelicerates: This includes spiders, scorpions, and horseshoe crabs, which possess chelicerae, a specialized mouthpart.

2. Mandibulates: This group encompasses insects and crustaceans that have mandibles, or jaw-like structures.

3. Trilobites: Although they are now extinct, trilobites were one of the earliest groups of arthropods.

The terms annelids, cephalopods, and polychaetes refer to different phyla; annelids are segmented worms, cephalopods are a class within mollusks (which include squids and octopuses), and polychaetes are a type of annelid. Therefore, they are not classified as arthropods.

Final Answer

The main groups of arthropods from the given options are:

• Chelicerates
• Mandibulates
• Trilobites