The ferns already had vascular tissues, which was a crucial feature for the plants to thrive on land. Jaa Sulje © Oskari Härmä ja e-Oppi Oy Tämän kuvan tekstivastine: (tyhjä tekstivastine) kallioimarre_oharma_eoppi_1377_peda.kallioimarre_oharma_eoppi_1377_peda_levea.jpg 470.7 kt
