Cognitive development is Jean Piaget's theory. Through a series of stages, Piaget proposed four stages of cognitive development: the sensorimotor, preoperational, concrete operational and formal operational period.
The versatility of Bifidobacterium longum as a lactic acid microorganism is reflected in its capacity to resist under harsh conditions such as stomach acid, bile, pH fluctuations, and gastrointestinal passage.
What is a microorganism? A microorganism is a small, typically single-celled organism, such  as a bacterium, virus, fungus, or algae, that is small enough to  require a microscope to observe it.41 people found this useful.Edit.hat is a microorganism? A microorganism is a small, typically single-celled organism, such  as a bacterium, virus, fungus, or algae, that is small enough to  require a microscope to observe it.