a naturalist observes the natural world
It depends on what kind of scientist it is. For example, botanists study plants.
global warming has started because of population of the o-zone layer are our world and many scientist think that the world might end IN 2012 "population of the o-zone layer" and "many scientist think that the world might end in 2012" Come on what kind of gobbledygook is that? Globan warming and global cooling are natural cycles caused by sunspot activity and other natural factors.
they observes the moon and how it rotate
forensic scientist
She was a biologist and an environmental scientist.
no
No ben Steve Jobs is not a scientist
I would be a chemist, what kind of scientist would you be?
The noun scientist is a singular, concrete, common noun.
medical scientist
Audiologist
An Ichthyologist.