A world within a world What type of organism has 20,000 species, covers between 6 to 8% of the Earth’s land surface and has some of the oldest living things amongst its numbers? Lichen. It’s amazing, isn’t it? Share this:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Pinterest (Opens in new window)Click to email a link to a friend (Opens in new window) Related Feel free to leave a Reply :) Cancel reply