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Sector 1 Biosphere is an orchestrated track from Metroid: Other M. As the name suggests, it is heard in Sector 1 / Biosphere. It is first heard when Samus descends into the "rainforest" where she battles Griptians after they are agitated by Little Birdie's cry. It is heard again when Samus is leaving the Breeding Room, after sensing "the presence of a dark intelligence", and then briefly as Adam unlocks the door to the long pathway. The theme gives a feeling of intrigue as Samus wonders what could have killed the scientist there. Sector 1 Biosphere is one of the tracks included on the Samus Archives Sound Selection CD that is packaged with the Special and Legacy Editions of Metroid: Samus Returns. It was composed by Kuniaki Haishima, and orchestrated by Sachiko Miyano.
The theme can be heard here: