Question

7 what impact do humans have on the carbon cycle? 8 why do scientists think there is an undiscovered carbon sink somewhere? the phosphorus cycle 9 why is phosphorus important to living things?

Explanation:

1. Humans impact the carbon - cycle through activities like burning fossil fuels (releasing large amounts of carbon dioxide), deforestation (reducing carbon - absorbing plants), and industrial processes.
2. Scientists think there is an undiscovered carbon sink because the amount of carbon dioxide emissions is not fully accounted for in the known carbon - cycle processes. Some carbon seems to be "missing" from the balance of sources and sinks.
3. Phosphorus is important to living things as it is a key component of DNA, RNA, and ATP (the energy - carrying molecule in cells), and is also involved in cell membrane structure.

Answer:

1. Humans impact the carbon cycle via burning fossil fuels, deforestation, and industrial processes.
2. Because some carbon emissions are unaccounted for in known processes.
3. It is a component of DNA, RNA, ATP, and cell membranes.