Which organism is unicellular and possesses a feeding groove?

The organism is EUGLENA SPP.
Euglena spp is a genus of unicellular flagellate organisms which can produce their own food and at the same time some eat already prepared food, thus they has characteristics of both plants and animals. Euglena species are usually found in streams, rivers, marshes and other water habitats. Euglena spp use their feeding groove to filter the water and get small food particles inside the water.

The answer is option a

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.