The major benefit of solar energy is its low: cost pollution maintenance complexity

The answer is pollution, because solar energy is costly, difficult to maintain, and fairly complex.

Pollution

Explanation: Solar energy can be defined as the radiant energy from the Sun that is harnessed using a range of technology. It is the range of ever evolving technology that uses solar heating, photovoltaic, solar photosynthesis.

This is a renewable form energy which is can be replenished again and again. Solar energy is a non polluting source of energy. It neither releases any harmful gases nor produces any sound.

So the correct answer is pollution.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

some fungi obtain their nutrients from a living host (plant or animal) and are called most biotrophic fungi have fairly narrow host ranges—they are specialized on a limited called rhizomorphs that allow the fungus to grow from one tree to another. ascospores are formed inside a sac-like structure called an ascus. so your answer is a