C or d i think but im prettu sure its c
The half-life of a radioisotope is the amon the symbol 42He, the subscript 2 is the mass number for helium and the superscript 4 is the atomic number for helium.
Answer:
The side groups are what make each amino acid different from the others. Of the 20 side groups used to make proteins, there are two main groups: polar and non-polar. These names refer to the way the side groups, sometimes called "R" groups, interact with the environment.
Explanation:
The landscape is a combination of nutritious grasslands and sparse woodlands: grassy areas dotted with Acacia trees, the iconic image of the Serengeti. The entire ecosystems spans 30,000 km^2 from North Tanzania extending to south- western Kenya.
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