Final answer:
A tissue is a group of cells in the body that are structured and work together to perform a specific function. There are four main types of tissues in humans: epithelial, muscle, nervous, and connective.
Step-by-step explanation:
A tissue is a group of cells that performs a unique set of tasks in the body. This is an organizational level that comes after the cell, the basic unit of life, and before organs, which are composed of multiple tissue types.
Biological tissue is composed of interconnected cells that are similar in structure and cooperate to perform a specific function within an organism. There are four fundamental types of tissues in the human body: epithelial, muscle, nervous, and connective tissues. Together, these make up all the organs in the body and are essential to human physiology.
Tissues are formed during the development of a fertilized egg into a newborn, through a process of cell division and differentiation, where cells specialize into the various types found throughout the body. These specialized cells group together to form tissues, which then organize into organs and organ systems.