Which of the followiing characteristics of living things is very important for a group or organisms, but not a single orgaism?
a
living things respond to their environment.
b
living things maintain internal balance
c
living things reproduce
d
living things are made up of units called cells

i think it's c

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.