This energy source is used to transform carbon dioxide and water into chemical energy by plants and other autotrophs

Sunlight

Explanation:

Photosynthesis is the biological process where planas (and autotrophs) use sunlight as an energy source to transform carbon dioxide and water into chemical energy. This process is extremely important for all life on earth, because it is through it that the plants capture the elements necessary for their growth and development, allowing these plants to develop sufficiently to participate in the feeding of numerous living beings directly or indirectly. . In addition, photosynthesis is a process responsible for the concentration of oxygen in the atmosphere, which is essential for the animals' breathing.

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.