(A) In earthworms,the blood is red in color due to the presence of the respiratory pigment $Hemoglobin$. Unlike humans,where $Hemoglobin$ is contained

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(A) In earthworms,the blood is red in color due to the presence of the respiratory pigment $Hemoglobin$. Unlike humans,where $Hemoglobin$ is contained within red blood cells,in earthworms,$Hemoglobin$ is dissolved directly in the blood plasma. This pigment helps in the transport of oxygen throughout the body.