Answer:
The correct answer is - true.
Explanation:
Primary producers are the organism in any ecosystem that is responsible for the primary production. These organisms are also called the autotrophs due to their ability to produce their own food and make a base for the food chain.
Primary producers or the autotrophs are present in almost every ecosystem as they are base of the food chain or food web and provide food and energy that move in the particular ecosystem. In terrestrial ecosystem plants are the primary producers generally, whereas in marine ecosystem algae or other plankton are considered are a primary producers.
Thus, the correct answer is - true.