Identify the animal that is NOT a non-chordate.

Reptiles 

The correct answer is Option (1) – Reptiles

Explanation:

Reptiles belong to the chordate group of animals, specifically within the subphylum Vertebrata. They are characterized by having a vertebral column (spine) and a dorsal nerve cord, both of which are hallmarks of chordates. Reptiles include animals like snakes, lizards, turtles, and crocodiles.

On the other hand:

• Arthropods: Arthropods are a diverse group of invertebrate animals characterized by having jointed appendages and a segmented body. They do not belong to the chordate group.
• Porifera: Porifera, commonly known as sponges, are simple multicellular animals that lack tissues and organs. They are also non-chordates.
• Arachnids: Arachnids are a class of arthropods that include spiders, scorpions, ticks, and mites. They are also non-chordates.