Which fuel has the shortest span of renewability?

Renewable resources are the resources of energy which can be rapidly replaced with the natural resources, such processes, such as energy derived from the wind or sun. The renewable fuels are a better way of deriving energy than from the non-renewable fuels such as the fossil fuels (LPG, and natural gas). The biofuels can be derived from the vegetable oils etc).

Hence, the answer is 'biofuels'.

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

d. planting trees

the trees take in carbon to make oxygen.