Answer:
Explanation:
The conversion of nitrogen gas (N2) into nitrates and nitrites through atmospheric, industrial and biological processes is called nitrogen fixation. Atmospheric nitrogen must be processed, or "fixed", into a usable form to be taken up by plants. Between 5 and 10 billion kg per year are fixed by lightning strikes, but most fixation is done by free-living or symbiotic bacteria known as diazotrophs. These bacteria have the nitrogenase enzyme that combines gaseous nitrogen with hydrogen to produce ammonia, which is converted by the bacteria into other organic compounds. Most biological nitrogen fixation occurs by the activity of Mo-nitrogenase, found in a wide variety of bacteria and some Archaea. Mo-nitrogenase is a complex two-component enzyme that has multiple metal-containing prosthetic groups.[22] An example of free-living bacteria is Azotobacter. Symbiotic nitrogen-fixing bacteria such as Rhizobium usually live in the root nodules of legumes (such as peas, alfalfa, and locust trees). Here they form a mutualistic relationship with the plant, producing ammonia in exchange for carbohydrates. Because of this relationship, legumes will often increase the nitrogen content of nitrogen-poor soils. A few non-legumes can also form such symbioses.
They usually travel to warmer locatina to lay their egg. they burrow into the sand and lay their eggs
The answer is; TRUE
This is the ultimate definition of a food chain. An example is fish that are eaten by seals and the seals are preyed upon by sharks. Seals are the prey of sharks but the predator of fish. This is how energy is transferred in a food web from the primary producers (phototropic organisms) to tertiary consumers.
Explanation:
Bacteria have a thin flexible cell wall. Only plant cells have primary and secondary cell walls.