https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13970132Edit ImageSaveSaveEditCropCustom TextBirch (Betula species): twigs and catkins. Pen and pencil drawings.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 738 px | 300 dpiLarge JPEG 3415 x 2100 px | 300 dpiFree DownloadBirch (Betula species): twigs and catkins. Pen and pencil drawings.More