Based on the given information, organism A and organism B would belong to different kingdoms. Organism A is fixed to one place and autotrophic, whereas organism B is fixed to one place and heterotrophic. Therefore, organism A belongs to Plantae kingdom and organism B belongs to Fungi kingdom.Plantae is a kingdom of autotrophic, multicellular eukaryotes that are fixed to one place. These organisms are generally photosynthetic, which means they produce their own food using energy from the sun. They are composed of cells with cell walls made of cellulose.Fungi, on the other hand, are heterotrophic, multicellular eukaryotes that are also fixed to one place. They do not produce their own food but obtain it by breaking down organic matter in their surroundings. They are composed of cells with cell walls made of chitin.