In the sentence extracted from biomedical literature, identify all the chemical entities. The required answer format is the same sentence with HTML <span> tags to mark up specific entities. 
### Entity Markup Guides:
Use <span class="chemical"> to denote a chemical.

### Input Text: Fine motor skills and gross motor function were significantly better in the control group ( p < 0 . 01 ) .
### Output Text:
Fine motor skills and gross motor function were significantly better in the control group ( p < 0 . 01 ) . 