Final answer:
Marram grass has the modification of cactus-like spines.
Step-by-step explanation:
Cactus-like spines Marram grass is a type of plant that grows in coastal areas and is well adapted to the harsh conditions such as high winds, salt spray, and shifting sand dunes. One of the main modifications shown by marram grass is having cactus-like spines. These spines help to reduce water loss and protect the plant from grazing animals.