Final answer:
An organism that obtains energy by ingesting other organisms is described as a consumer or heterotroph, which can be further classified as a herbivore, carnivore, or omnivore based on dietary habits.
Step-by-step explanation:
The terms that accurately describe an organism that obtains energy and organic molecules by ingesting other organisms are consumers, heterotrophs, and they can be further classified based on what they eat into herbivores, carnivores, and omnivores. Consumers, which include all animals, certain fungi, many bacteria, and even a few specialized plants, such as the pitcher plant, cannot produce their own food and rely on other organisms for energy. These organisms have various ways of 'eating' their food, with animals typically ingesting and then digesting their food, while fungi absorb nutrients directly from their environment.
Herbivores are consumers that eat only plants and are a crucial part of the food web, providing energy for carnivores and omnivores. Carnivores are animals that eat other animals, functioning as predators in the ecosystem, while omnivores can obtain energy from both plant and animal sources, giving them a varied diet within their habitats.