nutrients and water
If plants and animals lived forever, the nitrates in the Earth's soil would continuously cycle through the ecosystem. Plants would take up nitrates for growth, animals would consume plants, and when plants and animals die, their organic matter would decompose and release nitrates back into the soil for future use by plants.
If we did not take care of plants the world would not be as beautiful and plants give us a little oxygen,and we need oxygen to life.
Legumes when planted their roots will deposit nitrogen back into the soil. Most other plants such as corn and milo take nitrogen from the soil. Some legumes would be: clover, lezpedesa, and alfalfa.
yes, they would die without either of them. Practically all plants and seeds need water and soil.
compost soil
Without soil it would be impossible for a plant to grow because the plants gets almost everything from the soil.
Decomposers release phosphorus into the soil from decaying animals and plants. Plants can now take up the phosphates in the soil. When animals eat the plants, they then have phosphates in them and they are released back into the soil through waste and decompostion (decaying).
through their roots.
To take minerals from the soil.
Root
Yes, this is why plants can live in soil but not on solid rock.
If soil wasn't permeable, water wouldn't reach the plants. They would die.