Ashley asked me some questions on “Living Things” last night. Though I answered her questions based on my personal “experience”, I wasn’t too convinced of what I had said myself. Hence, I spent some time today to do a little research on the internet.
Here’re the Seven Characteristics of Living Things from “The Open Door Website“:
- Feeding – taking substance from the environment to survive
- Movement – internal and/or external
- Breathing or Respiration – exchange gases with their environment
- Excretion – removal of waste from the body
- Growth – in size and/or complexity
- Sensitivity – react to touch, light, heat, cold and sound
- Reproduction – produce young
The confusion comes in when some living things do not exhibit one or more of the seven characteristics, and some non-living things exhibiting some of the characteristics.
I’ve found a simple online quiz to help student understanding the differences between living and non-living organism. There’s another quiz that also differentiates between living thing, non-living thing, and “Non-living but once part of living thing”.
I strongly agree with this article by David Goldstein: “… It is in the nature of man to want to organize, classify and name anything that we study and a complicated system has been developed to try to match the extraordinary complexity of nature. We want to know how living things are related to each other and to things that once lived but are now extinct. However, any system we devise is manmade and will always in some sense be arbitrary. No matter how many levels of classification we have or how many divisions within each level are assigned, there will always be those who argue for different or fewer or greater divisions …”
For example, this is the full classification of a human:
- Domain Eukarya
- Kingdom Animalia
- Phylum Chordata
- Subphylum Vertebrata
- Class Mammalia
- Order Primates
- Family Hominidae
- Genus Homo
- Species sapiens
Now I know where the words “Animal” and “Mammal” come from. Learned something new today.