Class Trematoda: Infect the internal organs of hosts. Parasitic Can be endoparasites (live in the host) or ectoparasites (attach to external surfaces of the host. Size: ~ 1 cm to 10 cm Covered in an unciliated cuticle. Usually require 2 hosts to complete it's life cycle.
The difference between a mole and a wart is that moles are not contagious, but warts are. A mole, or nevus, is a collection of skin pigment cells. When they are small, they look like small brown dots. When the collection is larger, and slightly deeper, it can cause a raised skin colored bump over it.
A wart is typically a small growth that appears on a person's hands or feet and looks like a solid blister or a small cauliflower. They may also appear on other parts of the body. Warts have a rough texture and are caused by viruses, particularly one of several kinds of HPV (human papillomavirus).The virus causes keratin, which is a hard protein on the top layer of the skin, to grow too fast. Warts are not the same as moles.hey may also appear on other parts of the body. Warts have a rough texture and are caused by viruses, particularly one of several kinds of HPV (human papillomavirus). The virus causes keratin, which is a hard protein on the top layer of the skin, to grow too fast.