Read the passage and then answer the question: Lichen is composed of two organisms, an alga and a fungus. The fungus acts like a sponge, holding on to water that the alga needs. At the same time, the alga is constantly turning sunlight into energy, so the fungus, which cannot perform this function for itself, benefits from an **unwavering** energy source. Lichen has, in turn, a relationship with the tree that it grows on. The tree provides lichen with a place to grow, but the tree is unaffected. What is the meaning of "unwavering" as used in the passage? * 1.limited
2.new
3.uncertain
4.steady