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m_a_m_a [10]
2 years ago
6

Define the term excretion.

Biology
1 answer:
Arisa [49]2 years ago
4 0

The liver breaks down many substances in the blood, including toxins. The liver also excretes bilirubin — a waste product of hemoglobin catabolism — in bile. ... The lungs are responsible for the excretion of gaseous wastes, primarily carbon dioxide from cellular respiration in cells throughout the body.

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The antigen-binding sites of an antibody molecule are formed from the molecule's variable regions which are described as so because their amino acid sequences can be different on different antibodies.

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To know more about variable regions of antibodies, refer to the following link:

brainly.com/question/17439586
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