Embryonic stems cells differentiate into various tissues. Research suggests 1 point that it may be possible to replicate stem cells from mouse embryos. In the
future, human stem cells may be used to replace human tissue damaged
by diseases such are Parkinson's disease and multiple sclerosis. Why might
the use of stem cells taken from a patient to replace damaged tissues
decrease the potential risk to a patient? *
Retrieving donor stem cells from human embryos is difficult and controversial
Stem cells taken from a donor and implanted into a patient can be rejected by the
patient's immune system
Stem cells may not be able to differentiate into the correct cells and tissues needed
from the patient
Stem cells from a patient will not be destroyed by the patient's own immune system

The answer is a if u read the definition it makes sense

Birth orgraduate orschool

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.