Among these choices, the most energy-efficient form of animal movement, per kg of body mass, is

plant because they survive by water, sunlight, ex.

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

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.