The nitrogen gas in the atmosphere moves into the coil, where A. bacteria that live in the roots of certain plants convert the nitrogen gas to ammonia. This process is called B. nitrogen fixation. Lightning also converts nitrogen gas into usable nitrogen. Producers absorb the ammonia from the soil into their roots. But ammonia can't be used directly. In a process called C. nitrification, another kind of bacteria changes the ammonia into nitrites and then nitrates, a usable form. The producer can then use nitrates to make proteins and DNA. Nitrogen atoms are transferred from producers to consumers when animals eat plants. After plants and animals die and decompose, their proteins and DNA are broken down. Nitrogen atoms are released into the soil. How do these nitrogen atoms return to the atmosphere? In a D. denitrification a third kind of bacteria decomposes nitrogen compounds to form nitrogen gas. The gas returns to the atmosphere, and the cycle is completed and can be repeated again.
The nitrogen gas in the atmosphere moves into the coil, where ______ that live in the roots of certain plants convert the nitrogen gas to ammonia. This process is called _________ , Lightning also converts nitrogen gas into usable nitrogen. Producers absorb the ammonia from the soil into their roots. But ammonia cant be use directly. In a process called _______, another king of bacteria changes the ammonia into nitrites and then nitrates, a usable form. The producer can then use nitrates to make proteins and DNA. Nitrogen atoms are transferred from producers to consumers when animals eat plants. After plants and animals die and decompose, their proteins and DNA are broken down. Nitrogen atoms are released into the soil. How do these nitrogen atoms return to the atmosphere? In a _______ a third kind of bacteria decomposes nitrogen compounds to form nitrogen gas. The gas returns to the atmosphere, and the cycle is completed and can be repeated again.
A. bacteria
B. nitrogen fixation
C. nitrification
D. denitrification
1 answer