Light-headedness is a condition in
which an individual may feel dizzy or about to faint and it often goes away or
improves when one lies down. For the question above, you should respond by
having your coworker sit down in a cool area, and drink plenty of cold water.
I believe the answer you are looking for has to do with cells, they are the basic building block of life and are the smallest life that can support itself.
Answer:
a population that is adapted to an environment