More or interesting information about genetic mutation or condition for Down syndrome

i believe the answer is a or 1

2%? i tried finding the exact sorry if it's not 100% correct ; -;

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