Tissues are a collection of similar cells that perform specific functions

This is a true statement.

The levels of organization are a follows:

Atomic - these are the elements

Molecular - atoms of various elements bonded together

Cellular - composed of various molecules

Tissues - collections of cells that work together to perform specific functions

Organs - collections of tissues that work together to perform specific functions

Organ systems - collections of organs that work together to perform specific functions

Organism - a collection of organ systems working together to perform specific functions.