So what is the difference between you and a rock? This seems like an easy, even stupid question. But even the smartest people on earth have no idea where to draw the line between living and dead things. Which leads to mind-blowing implications. What is life after all? And is death really a thing? Lets look into it together
The 7 Characteristics of Life:
- Living Things are Composed of Cells:
- Single-cell organisms have everything they need to be self-sufficient.
- In multicellular organisms, specialization increases until some cells do only certain things.
- Living Things Have Different Levels of Organization:
- Both molecular and cellular organization.
- Living things must be able to organize 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 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.
- A behavior is 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 repoduction – 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.
- Do all living things have all of the characteristics of life? If your answer is no, give an example.
- Name some non-living thing that uses energy.
- Name some non-living thing that grows.