Earth’s history spans .
about 544 million years
around 1.8 million years
more than 4.6 billion years
less than 1 billion years

4.6 billion years

is the correct answer

HOPE IT HELPS thanks you

you can show her once, and if she doesn't do it, do what i do: i take away one of her privileges until she learns. it worked for my sister but note every child is different. or you canput her on 'time out' if she doesn't learn.

alzheimer's disease is a brain disease where you forget things that happened moments, even seconds before hand. reward me plz