In the context of energy flow through ecosystems, why are producers an essential component of an ecosystem?

• A. They capture energy (usually from sunlight) and convert it into chemical energy that supports all higher trophic levels.
• B. They break down dead organic matter and recycle nutrients as the primary source of energy for the ecosystem.
• C. They regulate population sizes by preying on herbivores, preventing overgrazing of vegetation.
• D. They obtain energy by consuming primary consumers and converting that energy into biomass.

Answer: (A)