What is the largest animal known to have ever lived on Earth?
- Blue whale
- Great white shark
- African elephant
- Giant squid
How many hearts does an octopus have?
- Three
- One
- Two
- Eight
Whales and dolphins are fish.
- True
- False
The Great Barrier Reef, the world's largest coral reef system, lies off the coast of which country?
- Australia
- Brazil
- Indonesia
- Mexico
What is the deepest known point in the world's oceans?
- Mariana Trench
- Puerto Rico Trench
- Java Trench
- Tonga Trench
A jellyfish has no centralized brain; instead it relies on a diffuse nerve ___ to detect touch, light, and chemicals in the water.
Sharks are a type of fish.
- True
- False
A group of fish swimming together in a coordinated way is commonly called a what?
- School
- Pod
- Flock
- Herd
Which is the largest living species of fish in the ocean today?
- Whale shark
- Great white shark
- Basking shark
- Manta ray
Because they are not actually fish, biologists increasingly prefer to call a starfish a sea ___.
How do dolphins primarily locate prey and navigate in dark or murky water?
- Echolocation
- Electroreception
- Bioluminescence
- Camouflage
The giant squid is one of the largest invertebrates known, growing to lengths of around 12 meters or more.
- True
- False
Corals, jellyfish, and sea anemones all belong to which group of animals, known for their stinging cells?
- Cnidarians
- Crustaceans
- Mollusks
- Echinoderms