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).
Angiosperms are flowering plants where the seeds are found in an ovary. Gymnosperms are evergreen plants where the seeds are naked, as in without an ovary. In angiosperms the pollen from the anther or male part of the plant ir released and when it lands on the stigma it travels into the ovary to fertilize an ovule. The seeds will develop inside the ovary which in plants like tomatoes or apples will become the fruit surrounding the seeds.