Life in CAMBRIAN is mostly primitive or unicellular, and all of them are aquatic, and there is no life on land. Among them, the famous representatives are trilobites, strange insects and strange shrimps.
The earth originated 4.6 billion years ago, but life didn't begin to appear until 500 million years ago. From 4.6 billion years ago to 500 million years ago, the earth was in an inanimate state.