Which statement best describes an effect of natural selection
A all of the organisms in a population are able to reproduce
B helpful traits passed to the next generation through reproduction
C hope for adaptions become less common in a population
D A population was little genetic variation grows in size

your answer should be c) enjoy!

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.