This is a repeat sign meaning to repeat the peice you just played. Your answer would be D.
I believe the answer is 20
The effects of the antibiotic drug celandine on Staphylococcus aureus bacteria<span>. The antibiotic kills the </span>bacteria<span> (red) by causing the cell wall to disintegrate yellow remnants.</span>
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Around the teen life, this is whe they have lost most teeth so you could say around ten years old so to make this easier you can say preteen.