Science, asked by angelriya77, 5 months ago

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4. Give reason:
a) Veins have valves.
b) Rings of cartilage are present in trachea.
5. Draw and label the structure of excretory system of human beings.
SECTION -C
6. a) Explain the steps that take place during photosynthesis
b) What are alveoli? What is it function?​

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