(A) In earthworms $(Pheretima)$,the alimentary canal is a straight tube. The gizzard is a muscular,thick-walled structure located in the anterior part

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(A) In earthworms $(Pheretima)$,the alimentary canal is a straight tube. The gizzard is a muscular,thick-walled structure located in the anterior part of the digestive tract. Its primary function is the grinding of decaying leaves and organic matter (food) into smaller particles,which facilitates easier digestion.