Answer:
many
pollution by dumping chemical that are harmful to the animals
littering by plastic
accidentally introducing invasive species
over fishing
 
it lowers the biodiversity of the aquatic ecosystems living there
Explanation:
 
        
             
        
        
        
The structure that is in the cell's nucleus that contains the genetic information if it is condensed and becomes wrapped and folded with many histone and other proteins, it is called chromosomes. 
Humans do have 46 chromosomes, 44 autosomal ones and 2 sex chromosomes.
        
                    
             
        
        
        
<span>the tidal mouth of a large river, where the tide meets the stream.</span>
        
             
        
        
        
Answer:
Phototropism refers to the movement of of plant body or parts towards or away from the light. There are two types of phototropism i. e. positive phototropism and negative phototropism. 
In positive phototropism, the parts of plant body moves toward light. Movements of radical in the upward direction after seed emergence is the example of positive phototropism. 
In negative phototropism, the body part of plant moves away from the light. Roots are the example of negative phototropism. 
 
        
                    
             
        
        
        
Answer: Diffusion occurs due to the random movement of particles. It usually happens due to a concentration gradient, meaning that molecules move from an area of high concentration to an area of lower concentration.
Explanation: