Single-celled organisms, such as bacteria, are often prokaryotes and as stated in name are made of only one cell.
Multi-cellular organisms, such as plants and animals (eukaryotes), have a higher degree of specialisation (i.e we have epithelial cells, muscle cells, etc). The cells can work and function together to create a living organism.
EX: a human -- cell then tissue then organs then organ systems and then the human body.
because it is the cell wall
Not really. Organisms are either one celled or multicelled. Tri-cells can be formed by uni celled organisms for reproduction.
Cells are the basic units of life. They range from one celled organisms to multicelled organisms such as us. We are made of between 75-100 trillion cells.
single-celled
single celled organisms
It is multi celled.
Organ, since it is composed if cells, tissues, molecule, and multi-celled organisms. Multi-celled organisms are only composed of one then one cell.
multicelled
Prokaryotes do not have a nucleus.
Multicellular
Erm...skin is an organ, not an organism, first of all, and multicelled as well.
One-celled organisms, like bacteria, are made up of a single cell that performs all the functions necessary for life, such as reproduction and metabolism. Many-celled organisms, like plants and animals, are composed of multiple cells that work together to carry out specific functions, leading to a greater degree of complexity and specialization in their structures and functions.