Potassium, 4 shells, 1 valence electron
Oxygen-16 and Carbon-12 are stableisotopes of elements O and C respectively. Hence, they do not have half-lives. But Carbon-14 andUranium-238 are radioactive isotopes. Among them Carbon-14 has relatively short half-life as about 5730 years while Uranium-238 has a long half-life as about 4.5 billion years.
Answer is. uranium-238
The answer is letter D.) the components of a cell
Environmental science is an interdisciplinary field that studies the interactions of the environment. The component of a cell can be studied through the lens of biology and may not require addition disciplines.
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Peripheral membrane proteins are indirectly interactive to the cell membrane, while the integral proteins interact with the peripheral proteins