Roundworms
Sam Drake
Germ Layers
Roundworms are triploblastic, which means their embryos have all three germ layers.
Cephalization
Yes, they have a head.
Body Cavity
Their body cavity is called a pseudocoelom.
Segmentation
Yes they have segmentation.
Circulatory System
A roundworm has no heart or formal blood vessel.
Respiratory System
A roundworm has no formal respiratory system.
Excretory System
A roundworm has an anus at its rear end and a series of excretory tubes that end in an excretory pore.
Nervous System
A roundworm has two nerve cords that transmit impulses in the roundworm.
Reproduction
A roundworm reproduces sexually.
Support
A roundworm has no skeleton.