Which organisms are labeled as primary consumers?

Herbivores

The correct answer is a) Herbivores.

Primary consumers are organisms that directly consume producers (plants or other autotrophs) as their primary source of food. They are also known as herbivores.

Herbivores are organisms that obtain their energy and nutrients by feeding on plant material. They consume parts of plants such as leaves, stems, fruits, or seeds. By consuming producers, herbivores play a crucial role in transferring energy from the lower trophic level to higher trophic levels in a food chain or food web.

Herbivores are called primary consumers because they occupy the trophic level immediately above the producers. They are the first consumers in the energy flow, converting plant biomass into their own biomass and obtaining energy from the organic compounds produced by plants through photosynthesis.

Examples of herbivores include animals such as rabbits, deer, cows, grasshoppers, and many species of insects. These organisms have specialized digestive systems and adaptations to efficiently extract nutrients from plant material.

It's important to note that while primary consumers are primarily herbivores, some organisms can exhibit omnivorous feeding habits, consuming both plant material and other animals. However, the term "primary consumer" generally refers to the herbivores within an ecosystem.