The sun is the primary source of energy. Without it, plants wouldn’t be alive. Without plants, consumers, such as herbivores, would not be alive because plants are the producers. So, the answer is D, the sun. If you still don’t understand, let me know and I will try to explain in further detail to the best of my ability. Hope this helped!
The protein is an organic compound which is made up of the amino acids methionine, arginine, and leucine etc.
<em>Explanation:</em>
Most of the amino acid are linked with others amino acid through peptide linkage to form proteins. The peptide bond is formed between the two amino acid involving carboxylic and amino group.
The proteins produce by this way may be simple, conjugated and derived proteins.
