Across5 deposit of partially decomposed vegetable matter6 organisms from this domain carry out methanogenesis8 CO2 is produced during ---------- cell respiration9 organisms that manufacture their own organic compounds10 sedimentary rock consisting mainly of calcium carbonate11 occurring in the absence of oxygenDown1 Chemical element produced during photosynthesis2 equivalent a one billion tonnes3 CH44 CO2 in water can form --------- acid7 CO2 is formed during ------ of organic matter****** Answers here