Quarter 3
Living Organisms
Living Organisms
Organisms, or any living thing, can be classified as unicellular (surviving with only one cell) or multicellular (needing multiple cells to stay alive).
Unicellular organisms, like bacteria, can only be seen with a microscope while multicellular organisms can be as small as a tick (but still visible to the naked eye). Multicellular organisms are more complex in structure and include plants, animals, and fungi.
The Human Body is made of a tremendous amount of animal cells (trillions) that have to work together for survival. These specialized cells work in groups and form tissues, and the layers of tissues make up various organs (e.g. heart, lungs, brain, etc.) in the body and work systematically to sustain the life of the organism.
The Human Body is made of a tremendous amount of animal cells (trillions) that have to work together for survival. These specialized cells work in groups and form tissues, and the layers of tissues make up various organs (e.g. heart, lungs, brain, etc.) in the body and work systematically to sustain the life of the organism.