The earthworm's crop and gizzard feel different because they perform two different functions. The gizzard is hard to the touch because it is used to grind the soil the earthworm takes into its body. The crop is soft and more saclike because it stores food that the earthworm separates from the other things it takes in.
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The esophagus of an earthworm is part of the earthworm's digestive tract, between the pharynx and the crop, and it basically just moves the earthworm's food from the pharynx to the crop. It also helps to keep the food from backing up (making the worm barf/throw up).
Most eathworms dont have ears, but if you get a few of them under a microscope it will show that very few earthworms have little ears, it can be hard to see the ears as they are havily surronded in skin.
Earthworms feed themselves by making their way through the soil. They do this by pulling soil into their mouth with their prostomium, (the first body segment of a worm excluding the mouth) combined with the muscular pharyngeal that is located on either side of the pharynx which causes the worm to actually suck in its food at a very high suction pressure. This is exactly why earthworms do not have eyes, food catching structures, or head appendages (includes nose and ears) . Earthworms also dont need ears because they have the senses that help them feel vibration in the soil. Their bodies have never needed to create such structures due to their natural way of moving and eating food. The food then enters the digestive system.
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