20210128_121612 Obligate ram ventilators #nature #sketch.jpg
20210128_121612 Obligate ram ventilators #nature #sketch.jpg

Sketches are (c) 2007-2020 Sacha Chua - Creative Commons Attribution License 4.0 unless otherwise specified. This means you can freely share and adapt the sketches (even commercially) if you include attribution (usually built into the sketch) and indicate the license and any changes.