Microalgae are responsible for producing 50% of the oxygen on Earth! We wouldn’t have been able to evolve without them and we wouldn’t be able to breathe without them. This sticker sheet contains 17 of my favorite microalgae (all photos I’ve taken), including diatoms, desmids and euglenas, along with an informational sticker and two stickers with the Couch Microscopy logo. They are high quality vinyl stickers that adhere permanently to surfaces like phones and laptops.