Causes. Sunburn results when the amount of exposure to the sun or other ultraviolet light source exceeds the ability of the melanin to protect the skin. Melanin is the skin's protective coloring (pigment).kin cancer usually appears in adulthood. But it is caused by sun exposure and sunburns that began as early as childhood. You can help prevent skin cancer by protecting your skin and your children's skin from the harmful rays of the sun.
The angiosperms, or flowering plants, are one of the major groups of extant seed plants and arguably the most diverse major extant plant group on the planet, with at least 260,000 living species classified in 453 families (Judd et al., 2002; APG II, 2003; Soltis et al., 2005).
Angiosperm are plants that flower and form fruits with seeds. Seeds are within a dry or fleshy fruit that develops from the ovary within the plant.And gymnosperm are seed pla â¦ nts having the ovules borne on open scales, usually in cones, and usually lacking true vessels in the woody tissue, including seed ferns, or conifers.eeds are within a dry or fleshy fruit that develops from the ovary within the plant. And gymnosperm are seed pla â¦ nts having the ovules borne on open scales, usually in cones, and usually lacking true vessels in the woody tissue, including seed ferns, or conifers.