An antimicrobial chemical was added to a population of bacteria. the initial population was 107 living cells (10,000,000). after 2 minutes, only 106 cells still remained alive. after another 2 minutes (4 minutes of total treatment), about how many cells would still be alive?

I believe after four minutes the population of the cells would be 10^5. Antimicrobial chemicals are those chemicals or agents that destroy or kill bacteria ad other pathogens. Therefore, addition of an antimicrobial chemical in a bacteria population triggers death of the cell, and since the rate of cell division is lower than the rate of death the number of cells reduces with time.According to te above information the population reduces by a factor of 10, thus if the initial population  was 10^7 after two minutes, the population was 10^6, which means after the next two minutes the population would be (10^6)/10 which gives 10^5

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation:

carbon 14 dating is used to determine the age of the sample by estimating the amount of carbon 14 present in the sample and then comparing it with a reference standard.carbon 14 is a isotope of carbon which is radioactive and unstable. carbon 14 is assimilated by all plants and animals throughout their life from carbon dioxide. however, one the organisms die they stop this assimilation and the carbon 14 content starts to decrease.by knowing how much of carbon 14 is left in an organism after his death, one can estimate the age of the organism. the materials whose age can be estimated by carbon 14 method are the organic compounds. however, some inorganic compounds such as aragonite   shell can also be dated.however, if we consider the igneous rocks it is a non living component which never accumulated carbon 14 in it and thus, we cannot use carbon 14 dating method to estimate its age.