Barriers are the circumstances or any other things that hinder the growth and the development of the social and mental state. Intrinsic barriers and learning are types. The problem is the extrinsic barrier.
<h3>What are the barriers and their types?</h3>
An intrinsic barrier is the physical, mental, motivation, and attention-based difficulties. The extrinsic barrier is the outer factor that impedes the learning of the individual and can be due to poverty, economical state, death etc.
Learning difficulty is the problem with educational learning and the methods. This can be due to the low mental quotient, unable to understand and comprehend the study topics. 
Therefore, it is an extrinsic barrier.
Learn more about the extrinsic barrier here:
brainly.com/question/25823012
 
        
                    
             
        
        
        
Answer:
i dont know but
Explanation:
Submerged native plants became shaded and often die.  Water hyacinth is native to South America, the only continent where natural predators such as weevils and moths keep it at bay. The plants can reproduce using a process called fragmentation
 
        
             
        
        
        
Answer: Tomato plant is a multicellular organism.
Explanation: A multicellular is a organism composed by many types of cells or cell lines. A tomato plant is composed not only by million of cells but by many types of them in the different tissues and organs, for example, leaves have epidermic cells that protect them, stomata cells for gas exchange, chlorenchyme cells that have chloroplasts to do photosynthesis, phloem and xylem cells to transport fluids, etc.
 
        
             
        
        
        
Answer:
what there's nothing there
Explanation:
 
        
             
        
        
        
Secondary succession occurs when a natural devastating calamity or event takes place such as hurricane and forest fire. It is often faster compared to primary succession because there are available resources already including soil, roots, seeds and other vegetative organs from plants can be found underground.