Learning may be defined as the process of change in the behavior of the organism by the result of its experience. Two main types of learning are innate learning and acquired learning.
Habituation may be defined as a type of the non associative learning in which the innate stimulus may get decrease after its repetition. The response of the new born can against the visual memory can be created by taking some picture as stimulus and repeat this stimulus again and again.
The nerve cells are scattered in each layer of the body wall and these neurons send information from sensory organs. Based on the given choices above, the organism that has a nerve net that allows it to respond to a stimulus in a coordinated way is the HYDRA.
