2.

during photosynthesis, plant cells take in water (h2o) and carbon dioxide (co2) and release oxygen (o2). how is this different from what takes place during aerobic respiration?

during aerobic respiration, the mitochondria form co2 during the process of fermentation.

during aerobic respiration, cells use atp to convert insulin into glucose and co2.

during aerobic respiration, o2 is inhaled and co2 and h2o are exhaled.

during aerobic respiration, cells take in o2 and release co2, h2o, and atp.

Remember that photosynthesis is respiration in "reverse".

If photosynthesis requires energy(light)+water+carbon dioxide and produces sugar and oxygen, using that sugar to get energy (ATP) back requires oxygen and produces water and CO2

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.