I'm full of holes, flexible, and thin. I control what gets out as well what comes in. what am I ​

lipid

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

the answer is c. altitude. hope this ! #brainiac