The milestone 10th single "Biology" was chosen as the song to launch their third album "Chemistry". It received critical acclaim and positive reviews across the board.

This single stormed into the chart at #4, their 10th Top 10 single in a row.  To their credit, the girls managed to outsell Will Young's long awaited single "Switch It On", which ended up only reaching #5, his lowest peaking single up to this point.  Girls Aloud also outsold 2005�s Children In Need single by Liberty X - "A Night To Remember" reached #6. 

"Biology" sold just fewer than 26,000 copies in its first week and went on to sell over 100,000 copies in total, making it the most successful release from the "Chemistry" album by a significant amount.  It also peaked at #1 on the iTunes Main Download chart.

The single was released in Australia in early 2006, reaching #26 on their charts.

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UK Release Date: 14th November 2005

1. Biology [3.34]
2. The Show (Tony Lemezma Club Mix) [5.46]


 

1. Biology [3.34]
2. Nobody But You [4.10]
3. Biology (Tony Lamezma Remix) [5.15]
4. Biology (Video) [3.34]
5. Biology (Karaoke Video Version)
6. Game (Includes Ringtone)


[Biology spent 16 weeks in the UK Top 200]
[Biology spent 10 weeks in the Irish Top 50]
[Biology spent 6 weeks in the Australian Top 50]

* UK Radio Airplay Position: #34
* UK TV Airplay Position: #01
* iTunes Peak: #01
 

First Week Sales: 25,917
Total Sales: 
119,323 [up to 30/12/07]
2005 EOY Chart UK: #65
Certificate = N/A
Albums: | Sound Of The Underground | What Will The Neighbours Say | Chemistry |
| The Sound of Girls Aloud: The Greatest Hits  | Tangled Up | Out Of Control |
   

Singles:

| Sound Of The Underground | No Good Advice | Life Got Cold | Jump | The Show | Love Machine |
 | I'll Stand By You | Wake Me Up | Long Hot Summer | Biology | See The Day | Whole Lotta History |
| Something Kinda Ooooh | I Think We're Alone Now | Walk This Way |
| Sexy! No No No... | Call The Shots | Can't Speak French | The Promise |