Which characteristic do most adult fungi and plants share?

Most adult fungi and plants share the characteristic of having cells with cell walls. This structural feature is crucial for providing shape and rigidity to the cells, which is essential for the overall structure and function of these organisms. In plants, the cell walls are primarily composed of cellulose, a carbohydrate that supports and protects the plant cells. In fungi, the cell walls are made of chitin, which serves a similar purpose in maintaining cell integrity and protecting against environmental stresses.

While plants possess chlorophyll and can carry out photosynthesis, fungi do not have this capability, as they are heterotrophic and absorb nutrients from their surroundings instead of producing their own food. The ability to reproduce asexually is not a universal trait; while both groups can reproduce through this method, many fungi also reproduce sexually, and not all plants do so asexually. Finally, both fungi and plants are generally stationary organisms and do not possess the ability to move independently like animals do. Hence, the sharing of cell walls is the most defining characteristic linking adult fungi and plants.