The earth's magnetic shield has?

Question

a) appeared only recently
b)disappeared for short periods of time
c)caused the earth's land masses to drift apart
d)little effect on life this planet
e)existed since the planet cooled

Just need to know if my answer or right or wrong. Thanks! :)

e

Answer 1

yes, correct. You have a very easy teacher.

Answer 2

thanks bobpursley :)