Life cycle of the following, Nematodes, cestodes, trematodes?

Nematodes (roundworms):
1. Egg: Nematodes start their life cycle as eggs, which are passed out of the host's body through feces.
2. Larvae: The eggs hatch into larvae in the environment, where they can infect a new host through ingestion or penetration of the skin.
3. Adult: Once inside the host, the larvae develop into adult nematodes, which reproduce and produce eggs to continue the life cycle.

Cestodes (tapeworms):
1. Egg: Cestodes start their life cycle as eggs, which are passed out of the host's body through feces.
2. Larvae: The eggs hatch into larvae in the environment, where they are ingested by an intermediate host (such as a flea or a small animal).
3. Cysticercoid: The larvae develop into cysticercoids in the intermediate host, which can then be ingested by the definitive host (such as a human).
4. Adult: Once inside the definitive host, the cysticercoids develop into adult cestodes, which attach to the host's intestines and reproduce to produce eggs.

Trematodes (flukes):
1. Egg: Trematodes start their life cycle as eggs, which are passed out of the host's body through feces.
2. Miracidium: The eggs hatch into miracidia in the water, where they infect a snail host.
3. Sporocyst and Redia: The miracidia develop into sporocysts and rediae within the snail host, where they reproduce asexually.
4. Cercaria: The sporocysts and rediae release cercariae, which can infect a secondary host (such as a fish or a human).
5. Metacercaria: The cercariae develop into metacercariae in the secondary host, which can then be ingested by the definitive host.
6. Adult: Once inside the definitive host, the metacercariae develop into adult trematodes, which reproduce and produce eggs to continue the life cycle.

Nematodes

- Egg: Laid in soil or water
- Larva (first stage): Hatches from egg and feeds on organic matter
- Larva (second stage): Molts and continues to feed
- Larva (third stage): Molts and becomes infective
- Adult: Lives in the soil or water and feeds on organic matter or other nematodes

Cestodes

- Egg: Laid in the feces of an infected host
- Larva (onchosphere): Hatches from egg and develops inside an intermediate host
- Larva (cysticercus): Develops inside the intermediate host and forms a cyst
- Adult: Lives in the intestine of a definitive host

Trematodes

- Egg: Laid in the feces of an infected host
- Miracidium: Hatches from egg and swims in water
- Sporocyst: Develops inside a snail or other intermediate host
- Redia: Develops inside the intermediate host and gives rise to cercariae
- Cercaria: Leaves the intermediate host and develops into a metacercaria
- Metacercaria: Encysts on a plant or in the flesh of a fish
- Adult: Lives in the liver, intestine, or other organs of a definitive host