CoachA living thing is something that is alive: it is born, it feeds, it grows, it can have babies, and one day it dies. Animals and plants are living things. Biology is the science that studies them.
Examples
Example 1.2 (The snail and the pebble)
The snail was born from a tiny egg. It eats salad leaves. It grows — its shell grows with it. There can be baby snails. So the snail is a living thing. The pebble eats nothing, grows not at all, and never has baby pebbles: the pebble is not living.
Example 1.6 (The wooden table)
A wooden table does not feed and does not grow: it is not living. But its wood once was: it comes from a tree that was born from a seed, grew for many years, and was cut down. The table is non-living — and it comes from a living thing.