I guess the stomach is held in place by a variety of Muscle cells, Epithelial cells, and connecting tissues; so the answer is: all of the above.
Ecosystems can be large and are made of biomes. Some examples of ecosystems are deserts and forests.
Homeostasis is the upkeep of a steady interior condition. In the Biology setting, it implies a consistent body condition, for instance, steady body temperature, blood glucose level. Metabolism alludes to the responses that occur in the body which enables life to be kept up. You need digestion occurring keeping in mind the end goal to look after homeostasis.
