Evolutionary history of plants seed model is shared by basically all gymnosperms (literally: "naked seeds"), most of which encase their seeds in a woody cone or fleshy aril (the yew, for example), but none of which fully enclose their seeds. The angiosperms ("vessel seeds") are the only group to fully enclose the seed, in a carpel. Fully enclosed seeds opened up a new pathway for plants to follow: that of seed dormancy. The embryo, completely isolated from the external atmosphere and hence protected from desiccation, could survive some years of drought before germinating. Gymnosperm seeds from the Late Carboniferous have been found to contain
Seeds of Diversity become prone to colony collapse disorder, which threatens the production of many insect-pollinated crops. Native bees are also in decline, which is partly due to loss of nesting sites in plant debris and in open untilled ground, and partly due to reduced diversity of food plants. Seeds of Diversity initiated a project called Pollination Canada with the aim of increasing awareness of native bees and alternative pollinating insects in order to protect them, so that farmers and urban gardeners can decrease their dependence on honey bees. Pollination Canada has 28 other partner organizations. In February 2013, Gretchen Bauta, Canadian philanthropist