railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Biology Human body

ખોરાકના પાચનમાં શું મદદ કરે છે?

1
કાર્બન
2
હિલીયમ
3
પ્રાણવાયુ
4
લાળ
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