When oxygen is absent, anaerobic respiration occurs ('an' means without).
1) D
2) B
3) C
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1. 50, 10grams passed through barrier to equalize
2. 50, same as 1
3. 40, can’t pass through barrier
4. 60, same as 3
5. water level rises in side2, lowers in side 1 because 10 grams of liquid passed through barrier
Answer:
the body of arboreal animals is flexible that enables them to pass through narrow branches.