* Tissue is a group of similar cells that work together to perform a specific function. For example, muscle tissue contracts, nervous tissue transmits signals, and epithelial tissue forms linings.
* An egg is a single cell, although it's a very large and complex one. It contains all the necessary components to develop into a complete organism, including the yolk, which provides nutrition, and the nucleus, which contains the genetic material.
Therefore, an egg is a single cell, not a group of cells, and therefore not a tissue.
