Answer:
Lichens are not parasitic when they grow on trees, they just use the tree bark as a home. They enrich the soil by trapping water, dust and silt. When lichens die they contribute organic matter to the soil, improving the soil so that other plants can grow there.
Answer:
Thus, the correct answer is 'Carbon dioxide, water, and sunlight'.
Carbon is so important because it’s how living things breath
Igneous rock?? sorry if this is wrong