Answer:
The type of organism that always occurs at the first step in every food chain is option 3: producers (plants).
Explanation: Please let me know if this helped have a nice day!
Producers, such as plants, are the organisms that convert sunlight, water, and carbon dioxide into food through a process called photosynthesis. They are able to produce their own energy-rich molecules, such as glucose, which is used for growth and maintenance.
In a food chain, producers are at the base because they provide food and energy for other organisms. Herbivores, which are organisms that eat plants, consume producers to obtain energy. For example, a rabbit eating grass is an example of a herbivore consuming a producer.
Carnivores, on the other hand, eat other animals. They obtain their energy by consuming other organisms in the food chain. Carnivores can be seen as secondary consumers or higher up in the food chain. For example, a lion eating a zebra is an example of a carnivore consuming a herbivore.
Decomposers, such as bacteria and fungi, break down dead organisms and waste materials into simpler substances. They play an important role in recycling nutrients back into the environment, but they are not always present at the first step of a food chain.
In summary, producers (plants) are the organisms that always occur at the first step in every food chain, as they convert sunlight into energy-rich molecules that can be consumed by other organisms.