To observe how plants compete for space, seeds were tested in an experiment. The same amount of soil was put into each of five plastic cups. Two seeds were planted in the first cup, 4 seeds were planted in the second cup, 8 seeds in the third cup, and 16 seeds were planted in the fourth cup. Only one seed was planted in the last cup to compare with the other pots. After 25 days, the height of the plants was measured to determine which plants grew best. what is the control of this experiment

c

explanation:

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.

producers within ecosystems are essential as they are at the base of the food chain. plants are examples of producers. they use the process of photosynthesis to capture light energy and use it to convert simple inorganic substances (carbon dioxide and water) into organic substances (glucose).