Answer:
A. An increase in nutrients
Explanation:
By definition, eutrophication is excessive richness of nutrients in a lake or body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen.
 
        
             
        
        
        
white dwarf
Explanation:
A appears on the chart at the point of low luminosity but high surface temperatures. This indicated  a White Dwarf
A red giant is highly luminous stars mainly because of its large size. However, its surface temperature is hot a high when compared to white dwarfs. White dwarf surface temperatures can reach billions of degrees kelvin while red giants reach up to 5000 K on their surface. 
A white dwarf is the last sequence of a low-mass star cycle and follows the red giant phase. 
 
        
                    
             
        
        
        
If it’s a yes or no question then yes because they spread through organisms. there are many organisms in the water that bacteria can spread through
        
             
        
        
        
Genetic
since we are made from our dna
        
                    
             
        
        
        
Answer:
The carbon cycle describes the process in which carbon atoms continually travel from the atmosphere to the Earth and then back into the atmosphere. Since our planet and its atmosphere form a closed environment, the amount of carbon in this system does not change .
Excess carbon in the atmosphere warms the planet and helps plants on land grow more. Excess carbon in the ocean makes the water more acidic, putting marine life in danger. Carbon dioxide is added to the atmosphere naturally when organisms respire or decompose (decay), carbonate rocks are weathered, forest fires occur, and volcanoes erupt.