The advantages of trees: large size, more, light and heat are available, greater receipt of water and minerals, storage of more substances, the aerial part does not die off, various ways of pollination and distribution of fruits and seeds.
Benefits of grasses: wiping off the aboveground part, preserving buds underground, small living space, little need for water and nutrients, fast growth, resistance to winds, water absorption from the surface layers of the soil, lots of seeds.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.