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They are cold blooded organisms.
Schistosoma is not a nematode, is a genus of Trematode under Phylum Platyhelminthes meaning the flatworms, nematode are round unsegmented worms.
A nematode is a type of worm and there are trillions of atoms in one.
Yes, primary nodules don't have germinal centers(active B cells) while secondary nodules do.
Nodules