The basic unit of life is a D. cell. D is the correct answer because although life is also made up of the other options, in the end, they are all made up of cells. A tissue is a group of specialized cells, and an organ is made up of different tissues. An organ system is a system of organs that work together. Hope that helped you.
Producers are basically plants (aka living things) and consumers are basically herbivores or omivores. (Carnivores are also consumers but they don't eat plants.)
