Answer:
it has to be D he regularly meets his own goals
Explanation:
that's why he could be happy
Electroencephalogram. It's a monitoring method that looks at electrical activity in the brain.
I believe it's 4 cells in the first month.
Answer:skateboarding
Explanation:I bang my head to cause it bleeding a year ago
I think it is natural selection. genetic variation also could be a factor for physical variation over the years.