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Billions.
for more than 1,000 years!
with everythi g they have been using and everythig they had befor just more stuff
there might be life in mars
Domapine has been found in most animals that have been studied. It is a rather small and simple molecule and it has been around for a very long time. Even bacteria have it.
Gold and Copper have been studied only for its high value.
Everything in the Solar system. Some examples: comets, asteroids, meteorites, planets...
Drugs have been studied since human gathered herbs
There are so many fields that have not been studied in great depth. The least studied field is the one that hasn't been discovered yet.
Actually this statement is in the present perfect progressive tense, and to change it into passive it could be this way ( English has been being studied.), but as a matter of fact it is no longer be used in this way, as its sound is very unfamiliar, or the present perfect progressive tense is no longer used in the passive , but we can use the present perfect simple tense instead. so the right answer is " English has been studied."
The effects of inhaling carbon particulate matter have been widely studied in humans and animals and include asthma, lung cancer, cardiovascular issues, and premature death.
alot.
A drawing that has been looked at and studied (read)?
Billions.
Pi have been studied for over 10 centuries!!!
Such information has never been researched or studied.
for more than 1,000 years!