“Last year, came the suggestion that sponges transformed Earth's deep oceans 750 million years ago, turning them into an oxygen-rich haven for life. Now it seems tiny bacteria living inside the sponges also played a part in the drama.”
Fan Zhang of the University of Maryland in Baltimore thinks that sponges and bacteria might have “evolved a hyper-efficient system for extracting phosphorus”.
New Scientist explains the reasoning behind this speculation:
“Phosphorus is an essential but rare nutrient for ocean life. Like all marine organisms, sponges need it to survive but can't extract it from the water – but the bacteria can help them out. Meanwhile, bacteria need the sponges to pump vast amounts of seawater over them so they can extract more phosphorus.”
Without a massive infusion of genetic information the oceans would be absolutely dead. We can read the best and most logical explanation for complex life in the seas in Genesis 1:20 “Then God said, ‘Let the waters teem with swarms of living creatures’ “ (NASB).
Brahic, Catherine. 2015. Were early seas transformed by sponge microbiome? New Scientist (23 February).