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Answer:

Tissue:any of the distinct types of material of which animals or plants are made, consisting of specialized cells and their products.

Organs:a part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in humans.

Organ Systems: A system is a group of organs that work together to perform a certain function in an organism’s body

Explanation:

Big brain
Tissue: Tissue is a group of cells that have similar structure and that function together as a unit. Primary types of body tissues include epithelial, connective, muscular, and nervous tissues.
Organs: An organ in a multicellular organism is a collection of tissues which are grouped in order to carry out a particular function. Each tissue in an organ consists of similar specialised cells.
Organ systems: An organ system is a group of organs that work together as a biological system to perform one or more functions. Each organ does a particular job in the body, and is made up of distinct tissues.

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