I think carbon and hydrogen.
Invertebrates have no spine, and they often don't have nearly as many organs as vertebrates. Overall, they are much simpler organisms.
Answer:
Protein
Explanation:
Protein calories is used as energy source when the body lacks fat or carbohydrates.
Hare: primary consumer
Wolf: Secondary Consumer
the hare is eating the plants which are producers and is a herbivore but since it still has natural predators it can only be a primary consumer. The wolf on the other hand has no nature predators besides maybe humans so in this ecosystem it is at the top of the web.
