Cuál de los siguientes enunciados sobre el ciclo del nitrógeno es cierto? A. Aunque el nitrógeno es el gas atmosférico más abundante, las plantas no lo pueden utilizar directamente del aire.
B. El adicionar fertilizantes sintéticos a los campos de cultivo remueve nitrógeno necesario del ciclo.
C. Los relámpagos toman moléculas extra de nitrogeno atmosférico y lo reciclan.
D. Las bacterias localizadas en el suelo atrapan exceso de oxígeno atmosférico y lo ayudan a entrar a las raíces de las plantas.

prophase: we can observe the chromosomes to coil up and condense. they become visible. nuclear membrane and envelope disintigrate.s

metaphase: chromosomes align at the center, the metaphase plate. spindle fibers attach to centromeres of the sister chromatids. they meet at kinetochores.

anaphase: sister chromatids are pulled towards each opposing centromere, set on different poles.

telophase: chromosomes are now clustered up only on either sides of the cell. nuclear membranes reform, and a new cell wall forms along the cell plate. this will lead to cytokinesis, the process that divides the cell membrane and forms the cell wall.

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )

the sun creates it's own light, also gives light and life to bunch of stuff like plants,animals,humans etc.photosyntesis is the process of making food which needs sun,water,nutrients etc.