Exposing humans to potentially dangerous levels of radiation as used x-rays can be fatal. X-rays are able to denature and mutate genetic molecules such as DNA and RNA, hence it can be described as a mutagen. An ultrasound scan however uses sound to create an image - this involves no radiation and is hence far safer. It is one of the reasons why it is used to examine foetuses and babies when in the uturus. The ultrasound also allows the kidney's topography and underlying structures to be observed.
If you mean periodic table then it would be atomic number
A bone mineral density (BMD) test measures how much calcium and other types of minerals are in an area of your bone.
<u><em>Answer:</em></u>
<em>A cofactor is any non-protein substance required for a protein to be catalytically active. Some cofactors are inorganic, such as the metal atoms zinc, iron, and copper in various oxidation states. Others, such as most vitamins, are organic.</em>
<em />
<u><em>Explanation:</em></u>
<em>*Hope this helped*</em>
<u><em /></u>
Photosynthetic bacteria are the main evidence of life in
early universe. These bacteria most likely produced oxygen, which was a waste
product that was caused by photosynthesis. As the oxygen levels increased, many
early forms of life were poisoned. This caused the evolution of new organisms
that were able to utilize oxygen for breathing or respiration.
