1. What is the primary role of squids in the marine ecosystem? A) Producers B) Parasites C) Predators and prey D) Decomposers 2. How do squids primarily communicate with each other? A) Sound waves B) Electrical signals C) Color changes D) Physical contact 3. Which part of the squid contains its brain? A) Tentacles B) Mantle C) Beak D) Fins

1. C) Predators and prey<br />Squids are primarily predators in the marine ecosystem, feeding on smaller fish and crustaceans. They are also prey for larger marine animals such as sharks, dolphins, and whales.<br /><br />2. A) Sound waves<br />Squids primarily communicate with each other through sound waves. They produce a variety of sounds using specialized organs called "siphons" and use these sounds to communicate with other squids.<br /><br />3. B) Mantle<br />The brain of a squid is located in the mantle, which is the main body of the squid. The mantle contains the nervous system and the brain, which controls the squid's movements and other functions.