Biology / Unit 1 Bio 0111 short lesson, about 20 seconds
Matter and Elements
Captions available
The idea
Matter is any substance that occupies space and has mass; an element is matter that cannot be broken into simpler substances by ordinary reactions.
In practice
Carbon, oxygen, hydrogen, and nitrogen are the four elements that make up most of the matter in a living organism.
Where people slip
An element is defined by what a reaction cannot do to it, not by how common it is.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
- Nothing. This is a starting point.
Unlocks
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