Leeches are the class of annelids that has suckers. They use these to suck the blood out of humans and animals in order for them to survive.
The three classes of annelids are Polychaeta (marine worms with bristle-like structures called chaetae), Oligochaeta (terrestrial and freshwater worms like earthworms), and Hirudinea (leeches, which are typically found in freshwater environments).
Phylum Annelida, segmented worms Taxonomy of annelids may not be universally agreed upon. However, often 2 classes are proposed: Class Polychaeta Class Clitellata Clitellata is further subdivided into 2 subclasses, Subclass Oligochaeta (earthworms) and Subclass Hirudinea (leeches).
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Ectoderm, endoderm and mesoderm.
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The three classes of Phylum Annelida are Polychaeta, Oligochaeta, and Hirudinea. Polychaeta are marine worms with bristles called chaetae, Oligochaeta include earthworms with few chaetae, and Hirudinea are leeches that are mostly freshwater and have suckers for attachment.
Nerds retards metals suckers
Six primary classes, three intermediate classes (Junior High) Three Senior classes.
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Plants can reproduce by seeds, suckers and underground stem. some can also reproduce by spores.
There are eight possible phenotypic classes that can be generated from a three-point testcross: two parental classes and six recombinant classes.