Define tissues and state why there is a need for tissues in multicellular organisms?

The word "tissue" derives from the French word "tissu", which means something that is "woven".

Tissues are groups of cells that have a similar structure that acts together to perform a specific function.

In multicellular organisms, tissues are needed because it groups together and forms the necessary organs to perform a particular function at a definite place in the body.

There are 'four' different types of tissues found in animal: 

1. Connective Tissue

2. Muscle Tissue

3. Nervous Tissue, and

4. Epithelial Tissue

There are 'three' different types of tissues found in plants:

1. Vascular Tissue

2. Ground Tissue, and

3. Epidermal Tissue