human digestive system and magnify glass to show probiotics, bacteria, probiotics, virus, microorganisms. - 細菌 幅插畫檔、美工圖案、卡通及圖標
blue-green algae (living). gloeocapsa. cyanobacteria. nitrogen fixing. unicellular cells enclosed in layers. 250x h - 細菌 個照片及圖片檔
gloeocapsa. blue green algae, cyanobacteria. nitrogen fixing, unicellular algae cells enclosed in layers. 250x at 35mm. - 細菌 個照片及圖片檔
