The primary consumer in the food chain is the bottom level of animals that eat plants and grasses for nutrition.
FOR EXAMPLE: grasshopper
The correct option is D.
Although both bacteria and amoeba are unicellular organisms, the bacteria is considered to be a prokaryote because it lacks a true nucleus and membrane bound organelles and amoeba is considered to be a eukaryote because, it has a true nucleus and well defined cell organelles.
