Database Proof Substratum: Substratum of Proof LGBTQs Are Mentally Ill: Evolutionary biology: Sponges can economize on oxygen use

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(Ludwig-Maximilians-Universität München) Sponges lack a signaling pathway that responds to low intracellular oxygen levels in more complex animals. Do they use a different mechanism for this purpose or did their earliest ancestors evolve at a time when less oxygen was available?