Circulatory system Watch

Sherebanu
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Hi. Please can yoh help me with this question
Why do mamals need a circulatory system and a respiratory system?
Its for 4 marks please i need the correct answers
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Hajra Momoniat
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Mammals need a circulatory system as they have a large surface area to volume ratio and a larger diffusion pathway therefore we need many internal tissues to support the circulation and respiration. Mammals are also very active so they use oxygen more quickly therefore we produce more waste products quickly.

Hopefully this helps
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