The 7 Characteristics Of Life
The 7 Characteristics of Life:
All Living Things are Composed of Cells:
- Single-cell organisms have everything they need to be self-sufficient.
- In multicellular organisms, specialization occurs, where certain cells can only do one thing.
Different Levels of Organization:
- Molecular and cellular organization is present.
- Living things must be able to turn simple substances into complex ones.
- Living things organize cells at several levels:
- Tissue – a group of cells that perform a common function.
- Organ – a group of tissues that perform a common function.
- Organ system – a group of organs that perform a common function.
- Organism – any complete living thing.
Living Things Use Energy:
- Living things take in energy from their surroundings and use it for maintenance and growth.
Living Things Respond To Their Environment:
- Living things will make changes in response to a stimulus in their environment.
- They display behaviours, which are a complex set of responses.
Living Things Grow:
- Cell division – the orderly formation of new cells.
- Cell enlargement – the increase in size of a cell. Cells grow to a certain size and then divide.
- An organism gets larger as the number of its cells increases.
Living Things Reproduce:
- Reproduction is not essential for the survival of individual organisms, but must occur for a species to survive.
- All living things reproduce in one of the following ways:
- Asexual reproduction – Producing offspring without the use of gametes.
- Sexual reproduction – Producing offspring by the joining of sex cells.
Living Things Adapt To Their Environment:
- Adaptations are traits giving an organism an advantage in a certain environment.
- Variation of individuals is important for a healthy species.