Colour-enhanced, scanning electron mcrograph of the lining of the uterus (endometrium) showing the openings of the uterine glands highlighted in pink. Copyrighted work available under Creative Commons by-nc-nd UK.
infinity-imagined: Coccolithophores are microscopic algae that first appeared 220 million years ago, and flourished during the cretaceous period. They constantly remove carbon from the atmosphere as they die and sink to the ocean floor, producing chalk.
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