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There is not one single sensory organ but several. Eyes, ears, mouth (taste), skin (feel), nose (smell) and the elusive (not so much a physical organ) innate instinct aka intuition. All of these be it separate and/or combined make up the sensory organs. All of these, by way of the Nervous system and more particularly the brain, are what function as the sensory organ(s).
the mouth
Believe it or not, sponges are considered marine animals and do not have any sense organs.
cnidarians do not have excretory organs .mouth is only excretory organ to them
the organs are the mouth, pharynx, esophagus, stomach, small intestine, large intestine, rectum, and anus.
They are in the dolphins eyes, mouth, nose, ears, and its fins.
a jellyfish
The sensory organs located on the mouth and head of a fetal pig are not the same as adults. These organs include the eyes and nose.
The “Head-Foot” region contains the mouth and sensory organs as well as the foot, the foot contains organs for locomotion.
sponges are one invertebrate group which has no mouth, stomachs or other organs
The sensory organs developed around the mouth in an attempt to help the creature eat - that being the primary reason for senses. Because all the sensory organs were concentrated around the mouth that was the beginnings of the head. So you see - the concentration of sensory organs was the reason for the head. There was no head to begin with. The head (and brain) developed because that was where all the sensory organs (and mouth) were. As for an advantage. It might be advantageous to have your sensory organs as high as possible. The reason for this is obvious for sight and sound. Smelling however would benefit more if it were located in the feet. Consider dogs and pigs. As soon as they start smelling they put their nose (and the rest of the head as well) to the ground. Feeling is not found concentrated in the head but is omni-localized.
Mouth ,lungs ,and stomach
Holding sensory organs (eyes, pedipalps), the mouth, and the legs and musculature used to move these. Think of a spider's front bodypart.
mouth
The system of organs in an animal's body that processes food, including the mouth, esophagus, stomach, and intestines.
Because it's an animal ! Reptiles are a sub-family of the animals group.
No they are not. A gland, by definition, is an organ which secretes some substance (saliva, for example, sticking within the mouth). Taste buds are sensory organs. They do not secrete, they sense.