churn verb (CUSTOMERS) âº [ I or T ] specialized business If customers churn between different companies that provide a particular service, they change repeatedly from one to another.
Worms are not insects. Insects are in the Phylum Arthropoda, in the class Insecta. All Arthropoda have jointed body parts while Annelids are segmented but not jointed. Earthworms are in the class Oligochaeta (meaning they are segmented worms with only a few bristles). There is a bigger difference worms and Insects than between a Reptile and a Mammal.
We will use in the earthworm as our model animal, an Oligochaete (Evolutionary school-subclass, phylogenetic school, not sure), belonging to the class or clade Clitellata, or Annelids with a clitellum, a swelling towards the head of the animal. The other two major clades are the Polychaeta and Echiura.e will be comparing the earthworm to a typicalleech, (Subclass Hirudinea), also a Clitellate. The Hirudinea resemble the oligochaetes in their major habitats (fresh water and land) as well as in lack of parapodia and reduction of specialized head structures that we will find in the Polychaeta.