The correct answer is Colossal squid. Explanation & Key Takeaways: • Colossal squid (Mesonychoteuthis hamiltoni): • It is a very large deep-sea predator. • It is a species of least concern. • It is a massive squid that lives in the deep sea surrounding Antarctica. • It is the largest invertebrate on Earth, it also has the largest eyes of any animal. • Its combined body and tentacle lengths up to 46 feet (14 m) and weights of at least 1100 pounds (500 kg). • Hence, option 3 is correct. • Their tentacles are covered with suckers that are equipped with strong, sharp hooks, used in both capturing prey and fighting off predation. • It reproduces via internal fertilization. Related Concepts: • Invertebrate • They are any animal that lacks a vertebral column, or backbone. • Invertebrates are generally soft-bodied animals that lack a rigid internal skeleton for the attachment of muscles but often possess a hard outer skeleton that serves for body protection. • There are over 96% of all animal species on Earth are invertebrates. • The longest invertebrate is the ribbon worm which can grow to 180 feet long. • The smallest invertebrate is the rotifer or wheel animal, • Marine Invertebrates include corals, jellyfish, anemones, and starfish. • Mollusks - They have a soft body that is covered by an outer layer called a mantle. • e.g: squid, snails, slugs, octopuses, and oysters. • Crustaceans - Crustaceans are a type of arthropod, meaning that they have jointed legs. • They also have an exoskeleton. • Examples of crustaceans are crabs, lobster, shrimp, and barnacles.