Which of the following substances contain water? (i) Milk(ii) Blood(iii) Oil(iv) Fruits

Blood has water your body is made up mostly of water that goes through your body

Blood contains a large amount of water because your body is made up of 90% water.
Even fruits like watermelon, cucumber contain water.
Milk contains a little amount of water.
Oil too contain little amount of water.

Actually almost everything contains water but as blood contains more water, it is the right answer.
Hope this helps you!

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Than y you put it in    biology