The video explains that invertebrates are animals without a backbone, making up 95% of the animal kingdom. It discusses their classification into groups such as insects, arachnids, and mollusks. Invertebrates like beetles have an exoskeleton for support. Arachnids include spiders and scorpions, while mollusks are diverse and can swim rapidly. Overall, invertebrates are the most diverse group of organisms on Earth.

What percentage of the animal kingdom do invertebrates constitute?

• 100%

• 95%

• 75%

• 50%

Which feature helps insects like beetles to support their bodies?

• Endoskeleton

• Exoskeleton

• Hydroskeleton

• Cartilage

Which of the following is NOT an arachnid?

• Beetle

• Tick

• Scorpion

• Spider

What is a characteristic feature of mollusks?

• They are all terrestrial.

• They have a backbone.

• They can swim at high speeds.

• They have eight legs.

Which group of organisms is considered the most diverse on Earth?

• Birds

• Mammals

• Mollusks

• Reptiles