Multicellular organisms are composed of more than one cell, with groups of cells differentiating to take on specialized functions. The cells of multicellular organisms may also look different according to the organelles needed inside of the cell.

From HA: Being made up of many small cells helps to insure an oirganism’s survival. If an organism was made up of only a few larger cells and one died, is injured, or the information is lost, it would make the organism more vulnerable. Whereas with many small cells it is easier to recover.

Humans are complex organisms made up of trillions of cells, each with their own structure and function. These cells all work in harmony to carry out all the basic functions necessary for humans to survive. But it’s not just human cells inside your body.

List of Pros of Multicellular Organisms.

• Intelligence and Evolution.
• Bigger Is Better.
• Less Stress Equals A Longer Lifespan.
• Cells Can Take Care Of Each Other.
• More Energy Is Needed For Normal Functioning.
• Infection Becomes A Possibility When Multicellular.
• Takes Longer To Reach Maturity And To Breed.

Following are the disadvantages of multicellularity: A multicellular organism needs more food than unicellular organsism because it needs more energy. In multicellular organisms, cells are organized into tissues and tissues are further organised into organs. So, if one organ fails, then whole organism can fail.

Advantages/ Disadvantages – Unicellular. Advantages- If you are unicellular you will be able to reproduce very quickly, thereby making more of your type of cells quickly. Unicellular organisms don’t live as long and multicellular organisms. Unicellular organisms are smaller and they are faster at reproduction.

Reproduce quickly because they are simple organisms. Do not live as long as multicellular organisms because there is only one cell to complete all life functions (jobs). Usually need to live in water or moisture because they can dry out quickly. They must also have a food-rich environment.

The levels, from smallest to largest, are: molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere.

There are 13 levels of organization. In sequence, they are represented as atoms, molecules, organelles, cells, tissues, organs, organ systems, organisms, population, community, ecosystem, biome, and biosphere.