Lithium, Boron, Florine, Silicon, Vanadium, Chromium, Manganese, Zinc, Copper, Nickel, Cobalt, Iron, Arsenic (yes, but in very small amounts), Selenium, Bromine, Strontium, Molybdenum, and Iodine.
Trace elements may be defined as the elements that are present in very small or minute amounts. These trace elements are present in our body with addition to the organic compounds.
The trace elements may work as co factors, co enzymes and secondary small metabolites in the body. Different trace elements found in body are Zinc, Copper, Iron and Cobalt. Iron is the important trace element of the body that required by hemoglobin for its function.
Thus, the answer is Zinc, Copper, Iron and Cobalt.
The population would decrease because the high death rate and low other rates would lead to more deaths than births, and not many other people would be entering the country/place, so the population would decrease
