Solenocytes occur in:
1.  Platyhelminthes
2.  Arthropoda
3.  Annelida
4.  Aschelminthes

The similarity between Ascaris lumbricoides and Anopheles stephensi is:
1. Sexual dimorphism
2. Metamerism
3. Anaerobic respiration
4. Endoparasitism

During its life cycle, Fasciola hepatica (liver fluke) infects its intermediate host and primary host at the following larval stage respectively:

1. Redia and miracidium

2. Cercaria and redia

3. Metacercaria and cercaria

4. Miracidium and metacercaria

In contrast to Annelids, Platyhelminths show:
1. Absence of body cavity
2. Presence of pseudocoelom
3. Radial symmetry
4. Bilateral symmetry