After the branching, what kind of environment do you think the "gray heads" lived in? Explain why you think so, providing evidence from your observations.

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

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.