Complex Animals: Annelids & Arthropods - CrashCourse Biology

The video explores the complexity and success of annelids and arthropods, highlighting their segmentation and evolutionary traits. It delves into the characteristics of annelida and arthropoda phyla, including their classes and unique features. The video also covers the diversity of arthropods, their exoskeletons, and metamorphosis, concluding with a discussion on crustaceans.

What is the estimated number of arthropods on Earth?

• 10 to the 20th power

• 10 to the 18th power

• 10 to the 15th power

• 10 to the 12th power

Which trait is shared by annelids, arthropods, and chordates?

• Jointed appendages

• Segmentation

• Exoskeleton

• Simple eyes

What is a synapomorphy of annelids?

• Exoskeleton

• Jointed legs

• Chaetae

• Simple eyes

Which class of annelids is known for having many bristles?

• Oligochaetes

• Hirudinea

• Polychaetes

• Nematodes

What is a defining feature of arthropods?

• Soft body

• Exoskeleton

• Single body segment

• Lack of appendages

Which sub-phylum of arthropods includes spiders and scorpions?

• Crustacea

• Hexapoda

• Cheliceriformes

• Myriapoda

What is unique about insect wings compared to birds and bats?

• They are made of bone

• They are not jointed

• They are extensions of the cuticle

• They are not used for flying

What is the process called when insects completely change shape during development?

• Partial metamorphosis

• Simple metamorphosis

• Gradual metamorphosis

• Complete metamorphosis

Which crustacean is known for having bioluminescence?

• Crab

• Barnacle

• Lobster

• Shrimp

What is a common feature of crustaceans and insects?

• Both are primarily terrestrial

• Both have three body segments

• Both lack jointed appendages

• Both have a cephalothorax