Answer:
Why is "sunlight" written above the arrow in the equation, rather than on the either side of it?
Sunlight is neither a raw material nor a product of the reaction, and is the energy source for the reaction.
The correct answer is protein.
Proteins are macromolecules composed of amino acids with the wide range of structures. Protein functions are diverse:
• structural proteins-maintaining the cell shape, (for example, proteins are structural elements in connective tissues like cartilage and bone in vertebrates),
• Enzymes - catalyze the biochemical reactions in cells-.
• Monitors- changing their activity in response to metabolic signals
• Part of the extracellular matrix or involved in intercellular communication…
If the prey is not getting enough food, they will eventually die which affects the number of predators because then the predator species would also die