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There are quite a few animals that contain tissues but lack complex organs. One of these animals is the jellyfish.
The localization of a brain and specialized sensory organs of an animal's head is known as cephalization. This presumed evolutionary process focuses on the creation of sensory organs in the anterior end of the head.
Primitive life forms tend to be asymmetrical with no body plan, while advanced forms have either radial or bilateral symmetry, which are both detailed body plans. Primitive animals also have a sac-like body plan with no specialized organs for digestion, while advanced animals have a tube within a tube body plan that contains specialized digestive organs for more efficient digestion. Primitive animals have very basic, unsegmented bodies with no appendages, while advanced animals have segmented bodies that allow for specialized limbs and body parts.
Organs are a collection of specialized tissues.
In your body, cells make specialized tissues; specialized tissues make specialized organs; organs control major functioning within the body.
Specialized cells that have no organelles are known as Prokaryotes.
Pigeons do not have gallbladders. Usually only meat-eating animals will have gallbladders. Pigeons do have many other specialized organs, however.
Pulmonary system- contains tissues and organs specialized for taking in oxygen and removing carbon dioxide from our bodies and for exchanging oxygen and carbon dioxide.
a grouping of tissues into a distinct structure, as a heart or kidney in animals or a leaf or stamen in plants, that performs a specialized task.
Eyes and ears.
Contains organs involved in internal fertilizayion