What are the differences between a sheep heart and a frog heart? how do these differences show that a mammalian heart is more efficient?

The main difference between a sheep heart and a frog heart is that sheep have a four-chambered heart and frog three-chambered heart.

The heart of an amphibian, such as a frog, has three chambers, one ventricle and two atria. Blood from the ventricle travels to the lungs and skin where respiration occurs and where the blood becomes oxygenated. From the ventricle, blood also travels to the rest of the body where it becomes deoxygenated. In the ventricle, deoxygenated and oxygenated blood are mixed before being pumped out of the heart.

On the other hand, mammals (including sheep) have two atria and two completely divided ventricles. The left side of the heart pumps and receives only oxygenated blood while the right side of the heart pumps and receives only deoxygenated blood, meaning that their systemic and pulmonary systems are separated. The separation of these two systems enables mammals to deliver more oxygen to their tissues (because there is no mixing of oxygenated and deoxygenated blood). Thus, mammals' heart is more efficient.

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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.