Larger of the two bones in the forearm. Different types of tissue reflect sound waves differently. This makes it possible to find abnormal growths. Invisible rays that are part of the energy that comes from the sun.
Ultraviolet radiation can burn the skin and cause skin cancer.
UVB rays are more likely than UVA rays to cause sunburn, but UVA rays pass further into the skin. Scientists have long thought that UVB radiation can cause melamona and other types of skin cancer. They now think that UVA radiation also may add to skin damage that can lead to cancer. For this reason, skin specialists recommend that people use sunscreens that block both kinds of radiation. The fibrous cord-like structure containing two arteries and a vein and connecting the fetus to the placenta.