Roundworms are triploblastic, which means their embryos have all three germ layers.
They have bilateral symmetry.
Yes, They have a head.
Yes, roundworms have segmentation.
Yes they do. They have a mouth and an anus.
A roundworm has no heart or formal blood vessels.
A roundworm has an anus at its rear end and a series of excretory tubes that end in an excretory pore.
A roundworm has two nerve cords that transmit impulses in the roundworm.
A roundworm reproduces sexually. The female has an ovary, holds eggs in an oviduct and then passes them to the uterus, where they are fertilized. The male has sperm cells are made in the testis and stored in the vas deferens. When it is time to reproduce, the sperm cells pass through the spicule. Over 200,000 eggs can be deposited at once in the soil once they are fertilized.
A roundworm has no skeleton.