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The answer depends on earlier than WHAT? Earlier than the nineteenth century? Earlier than 6 BC? Earlier than 5,000,000 BC? In the last case, the answer is NONE!
Both may be correct in different contexts. A simple way to figure this out is finish the sentence. I arrived earlier than she (did). I heard him earlier than (I heard ) her.
There are far more than three - but three of them are 1) the optic tract, 2) the nigro-striatal tract, and 3) the mesocortico-limbic tract. And one more tract system,, out of many, is the corpus collosal tract system between the two cerebral hemispheres.
It matures at six yrs old ' younger than most humansisnt that cool :D
3pm is earlier than 5pm.
Generally, no. Girls usually develop earlier than boys.
Surprise or unexpected. Those words mean earlier than expected.
No, 356 BCE is earlier.
It was smaller than most earlier regions
I woke up earlier this morning than usual.
You can use "earlier" to refer to a time in the past, for example: "I woke up earlier today than I did yesterday." It can also be used to compare two points in time, like: "She finished her homework earlier than her classmates."
The healthcare system is reluctant to diagnose mental retardation any earlier than school age even as late as 13.