Raven spreads a printed table across the Windowsill, right beside the seed jar. "This is the real list from the biology text."
Rocket peers at the jar first. "No roots yet." Then he reads the table. "Eight rows. We know these."
"What do you notice about the tricky ones?" Raven asks. "A river flows, a fire grows, a crystal gets bigger."
Rocket thinks. "A fire uses energy and grows. But it has no cells. And it cannot reproduce by passing on DNA."
Nova hovers over the table. "Count how many rows a fire gets a yes in," she says.
"Two, maybe three," Rocket says. "Living things get all eight." Raven smiles. "Now you are reading data."
Concepts of Biology, an open college textbook, names eight characteristics that all groups of living organisms share.
Here they are with the text's own explanations, shortened. Read every row before you judge any object.
A living thing shows all eight, even if some are slow or hard to see. A nonliving thing may show one or two.
| Characteristic | What the text says, in short |
|---|---|
| Order | Highly organized structures made of one or more cells |
| Sensitivity or response to stimuli | Organisms respond to diverse stimuli, such as light or touch |
| Reproduction | DNA containing genes is passed along to offspring |
| Adaptation | A fit to the environment, a result of evolution by natural selection |
| Growth and development | Grow and develop according to instructions coded in genes |
| Regulation | Keep a relatively stable internal environment, such as body temperature |
| Energy processing | Use a source of energy: from the Sun, or from molecules taken in |
| Evolution | Populations change over time as the environment changes |
| Object and claim | True or false? |
|---|---|
| A river flows and gets wider, so it is alive. | ? |
| A dried bean is alive even though it looks still. | ? |
| A salt crystal that grows in a jar of salt water is alive. | ? |
| A sprout that bends toward the window is responding to a stimulus. | ? |
Careful reading. Tomorrow you look inside a seed, check your plant prediction and review the week.