Ans.
In all animals, the body is organized at various levels, which include cells, tissues, organs, organ systems. Cells are arranged into tissue and tissues are organized to form organs. Different organs with similar function form organ systems.
Eyes are organs of optic system and provide vision to animals. Eyes are composed of different types of tissues, which include dense connective tissue, pigmented loose connective tissue, and image-processing tissue or photoreceptors.
Thus, the correct answer is option). 'organ.'
