Dating uses the properties of atoms in rocks and other objects to find their ages.
a. comparative
c. approximate
b. absolute
d. relative

b. Absolute

Absolute dating is a process of determination of the age of the object like rock or once existing living organisms on the basis of the radioactive decay of atom or radioactive isotope. A radioactive counter is used that detects the amount of high energy particles emitted by the disintegration of the radioactive atoms in a geological material. It tries to find out the chronological age of the past events on the basis of the preserved fossil remains.

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.