It was very bright.
It was quite hot.
It was not so big.
It was 2 million yrs old.
It was made of electrons and neutrons.
Please mark as brainlest.
<span>E. Stimulation of T-cell by APC</span>
The initial exposure of the body to an infectious agent e.g. through a vaccine, triggers an immune response most of which rapidly diminishes after the vaccination. However some cells of the immune system called lymphocytes remain with a memory of that pathogen.As a result, if the same pathogen infects a vaccinated person, the memory cells remember and recognize it and rapidly spring into action triggering a much more rapid response specific to that pathogen than the initial exposure, effectively dealing and neutralizing the pathogen.
If an atom is unstable it can become stable by the gain or loss of electrons.
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