Sucrose is transported throughout plants in phloem tissue, as shown in the model. the varying concentrations of water and sucrose allow for the movement of both of these molecules through the plant. which explanation best describes the transport of sucrose in the plant? a) sucrose is moved into the companion cells and sieve tubes against its concentration by active transport. b) sucrose is moved into the companion cells along its concentration gradient by facilitated diffusion and then into the sieve tubes by osmosis. c) sucrose is moved into the companion cells against its concentration via active transport and then into the sieve tubes by facilitated diffusion. d) sucrose is moved into the companion cells along its concentration gradient by facilitated diffusion and then into the sieve tubes by simple diffusion.

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.

The direction a chemical reaction occurs is represented by an arrow