What are the 2 traits that indicate an animal's relative complexity?

Which type of organism is missing from the food web seen in the illustration? primary consumers decomposers primary producers secondary consumers

Which ideas did your answer contain? check all that apply. no food for organisms no oxygen in the atmosphere no trees or flowering plants no products based on trees or plants (building materials, medicines, fuels, fibers) no fossil fuels

What type of organism is a one-celled organism that functions as a single unit? a. bi-celled b. single-celled c. pre-celled d. multi-celled