There are exchanges that happen continuously in our bodies. One exchange is the gas exchange, or respiratory, system. This is the system where carbon dioxide is released from the lungs into the air, and oxygen is taken into the lungs from the air. This exchange happens in the air sacs of the lungs called the alveoli.
I think the answer to your question is sexual reproduction.
Answer:
The role of nitrogen-fixing bacteria is to supply plants with the vital nutrient that they cannot obtain from the air themselves. Bacteria take it from the air as a gas and release it to the soil, primarily as ammonia.
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Answer:
Gray bat ----- Flying insects (mayflies primarily) ----- algae ----- sunlight, oxygen etc.
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