Artificial nitrate or ammonia fertilizers. These are usually applied to crop fields but runoff in rains into surrounding streams and rivers, thus entering the environment.
Fertilizers are a human-made product that allows nitrogen to enter ecosystems. These products are used in agriculture to increase soil fertility and promote plant growth. However, excess use of fertilizers can lead to nitrogen runoff, which can cause water pollution and disrupt ecological balance.
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Absorbed by plants that need it or is washed into a nearby stream, not that that's good.
Nitrogen enters the food web when plants absorb nitrogen compounds from the soil and convert them into proteins.
Cornea
Nuclear Pores
Bacteria in the soil called nitrogen-fixing bacteria go through a process called nitrogen-fixation which allows nitrogen to enter the atmosphere
chlorophyll does not enter the plant, sunlight does.
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Absorbed by plants that need it or is washed into a nearby stream, not that that's good.
Nitrogen enters the food web when plants absorb nitrogen compounds from the soil and convert them into proteins.
Okay nitrogen is enter though the system of an animal cell
maybe
Nitrogen can enter the soil from plants such as legumes which fix nitrogen in their roots. Also dead plants and animals add nitrogen into the soil.
enter yes and no data
pupil
through special types of bacteria in the soil.
cell membrane