A gas cylinder or a burning paraffin heater may be used to add carbon (1) dioxide to the air in a greenhouse or greenhouse tunnel. Which of these methods would be better in a) summer and b) winter? Give a reason for each of your answers.​

i think the answer would be d

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

wegner's theory did not explain how the continents could move

explanation: