The correct answer is: A. Food Web
A food web is a network of interconnected food chains. It shows how energy and nutrients flow through an ecosystem. Food webs are important because they help to explain how different organisms interact with each other and how they are all connected.
A food chain is a linear sequence of organisms through which nutrients and energy pass in an ecosystem. The first organism in a food chain is called a producer. Producers are able to make their own food using sunlight, water, and carbon dioxide. Consumers are organisms that cannot make their own food and must eat other organisms to survive. Consumers are divided into primary consumers, secondary consumers, tertiary consumers, and so on. Primary consumers eat producers. Secondary consumers eat primary consumers. Tertiary consumers eat secondary consumers, and so on.
A trophic level is a position in a food chain. The trophic level of an organism is determined by what it eats. Producers are at the first trophic level. Consumers are at the second, third, and so on trophic levels.
A food pyramid is a diagram that shows the relative amounts of energy and biomass at each trophic level in a food chain. The base of the pyramid is the largest, and each level gets smaller as you go up. This is because there is less energy available at each higher trophic level.