Fungus, because Protist and Archaea are both single-celled, then Plants get their food from the sun, while Fungus is multi-cellular and decomposes other organisms for its food
True, this is because Darwin realised that organisms best suited to their environment are more likely to survive and reproduce, passing on their characters to their offsprings.
They all regulate and support your body’s functions. They all work together by stabilizing each detail and movement of your body and keeps it functioning.