Le Hw4.1.3b

Explanation
The autotrophs, also known as producers, are organisms that can produce their own energy through photosynthesis or chemosynthesis. They are typically found at the bottom of the energy pyramid as they convert sunlight or inorganic compounds into organic matter, which is then consumed by other organisms. In the given graph, level 1 has the highest amount of energy stored, indicating that it represents the autotrophs in the energy pyramid.

Explanation
The energy for use by organisms in level A originally comes from the Sun. Producers, such as plants, capture sunlight through photosynthesis and convert it into chemical energy. This energy is then passed on to other organisms in the food chain, including those in level A. The Sun is the ultimate source of energy for all living organisms on Earth, as it provides the necessary light and heat for photosynthesis and other metabolic processes.

Explanation
Autotrophs are organisms that can produce their own food through photosynthesis or chemosynthesis. They are typically found at the base of the energy pyramid as they are the primary producers of energy. In the given diagram, level D is at the bottom of the pyramid, indicating that it includes autotrophs.

Explanation
Level A in an energy pyramid typically represents the producers, which are the organisms that convert sunlight into energy through photosynthesis. Algae are photosynthetic organisms that can be found in aquatic environments, such as oceans, lakes, and ponds. They are able to capture sunlight and convert it into chemical energy, making them the most likely organisms to be found at level A of an energy pyramid.

Explanation
In an energy pyramid, the amount of available energy decreases as you move up the pyramid. The producers, which are represented by A in the diagram, have the largest amount of available energy because they convert sunlight into energy through photosynthesis. As you move up the pyramid to the primary consumers (B), secondary consumers (C), and tertiary consumers (E), the available energy decreases because each level relies on the level below it for energy. Therefore, A would have the largest amount of available energy in this ecosystem.

Explanation
Organisms C and E are carnivores because they are located at the highest trophic level in the energy pyramid. Carnivores are organisms that obtain their energy by consuming other animals. In this energy pyramid, organism C is positioned at the top, indicating that it is a tertiary consumer, while organism E is positioned just below, indicating that it is a secondary consumer. Both of these organisms rely on consuming other animals for their energy needs, making them carnivores.

Explanation
Level C includes organisms that receive their energy from level B. In an energy pyramid, each level represents a trophic level, with producers (such as plants) at the bottom and consumers (such as animals) at higher levels. Level B represents the primary consumers, which are herbivores that consume the producers for energy. Level C represents the secondary consumers, which are carnivores that consume the primary consumers for energy. Therefore, level C includes organisms that receive their energy from level B.

Explanation
The energy pyramid represents the flow of energy in an ecosystem, with each level consisting of organisms that obtain energy from the level below. In this case, level A is the producer level, which includes organisms such as plants that can produce their own energy through photosynthesis. These organisms do not rely on other organisms for energy and instead get their energy from sunlight. Therefore, level A includes organisms that get their energy exclusively from a source other than the organisms in this ecosystem.