Where the respiratory pigment forms in earthworm-
a. External skin
b. Heart
c. Blood glands
d. Lymph glands
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a. External skin
Because earthworm are living from only skin and they did not have heart, blood glands and lymph glands.
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Answer:
Respiratory pigment is haemoglobin and it is dissolved in blood plasma. The circulation in earthworm is closed type.
a.External skin
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