Science Mystery
5 XP
The Silent Guardian.
I protect every living cell,
Yet I am thinner than a strand of hair.
I decide what enters and what leaves,
Without me, life cannot survive.
Hint: Every cell has me.
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Earn 5 XP for the correct answer!
Earn 5 XP for the correct answer!
Brain Quest by
Mubeen Saeed
PSC Volunteer
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Quest Info
- Category
- Science Mystery
- Difficulty
- Easy
- Reward
- 5 XP
- Tried
- 16 volunteers
- Solved
- 16 (100%)
