Why is nitrogen fixation such an important step in the nitrogen cycle? question 5 options: decomposers need to use nh4+. plants can't use nitrogen in the form of n2. bacteria convert the fixed nitrogen back into n2. soil nitrogen is different. which of the following is the source of energy for the water cycle? question 4 options: gravity winds the sun volcanic eruptions

1. Nitrogen fixation is an essential process as the plants do not possess the tendency to use nitrogen in the form of N2. The bacteria known as nitrogen-fixing bacteria convert atmospheric nitrogen in the soil to ammonia, which can then be taken up by the plants.  

2. The process of the water cycle is mainly driven by the energy provided by the Sun. This solar energy mediates the cycle by evaporating water from the lakes, oceans, rivers, and even the soil. Other water moves from plants to the atmosphere via the procedure of transpiration.  

i think its control and coordinate because im pretty sure thats what tissue does and the joints are what control movement and then your skeletal/ bones provides portection. hope that .