Which characteristic is typical of Chara when compared to other plants?

Chara is often characterized by its calcified structure, which sets it apart from many other aquatic plants. The presence of calcium carbonate in its cell walls contributes to a tougher and somewhat brittle texture. This calcification enables Chara to withstand certain environmental stresses, making it more resilient in its aquatic habitat. Unlike softer plants, such as many species of water lilies or pondweeds, Chara's robust nature aids its ability to thrive in a variety of water conditions, including those that are often high in nutrients.

Furthermore, Chara’s typical growth form usually keeps it submerged at the bottom of water bodies, rather than adopting a free-floating habit, which is more characteristic of some aquatic plants. This structural difference in hardness and resilience is a key identifier of Chara as it grows in diverse environments, demonstrating how it has adapted differently compared to many other types of aquatic vegetation.