The producers are the main source of the food production in the ecosystem. The producers are the organism, which convert the energy from the sunlight into the chemical energy. The consumers use this chemical energy for carrying out the metabolic processes in their body. 
Without producers, the consumers cannot obtain their energy. Hence, the ecosystem without any producer would not survive. 
 
        
             
        
        
        
The genetic change causes alterations in only one or a few nucleotide bases in known as mutation.
A mutation is a change in a brief section of a genome's nucleotide sequence. Another frequently replaces one nucleotide in point mutations; other changes involve the insertion or deletion of one or more nucleotides. 
Errors in DNA replication or the harmful effects of mutagens, such as chemicals and radiation, which react with DNA and alter the architecture of individual nucleotides, are the leading causes of mutations. 
DNA repair enzymes are present in all cells and work to reduce the frequency of mutations. These enzymes reduce genetic information loss, double-strand break formation, and DNA crosslinking by repairing DNA damage.
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Leaves wilt.
Growth is slow.
Brown spots appear on leaf tips.
New and older leaves eventually turn yellow and fall at the same time.
Soil is constantly damp or drainage is too slow.
Roots become spongy, turn brown and rot.
        
             
        
        
        
Answer:
The correct answer is D
Explanation:
ATP is energy (starting from the sun) which is used within photosynthesis to form more energy/ATP.