Bacterium moves into an alga.

A recent study has discovered a rare evolutionary event in which a bacterium has evolved into an organelle within a single-celled alga found in oceans. This organelle, known as a nitroplast, is the first known nitrogen-fixing organelle and plays a crucial role in the success of these algae. The study also found that about half of the proteins inside the organelle come from the algal host, suggesting a close relationship between the two organisms. This research could potentially provide insights into integrating nitrogen fixation into plant cells, which could have significant implications for agriculture and reducing greenhouse gas emissions. [Extracted from the article]

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