Mercury is a naturally occurring element, but human activity mobilizes mercury in the environment, making it more bioavailable.
Mercury is mobilized by human activity in the environment.
Mercury was an artificially created element for warfare.
Strategies designed to get rid of cultural barriers are one of the skills taught to staff through the CAP workshop.
A few men are fishing.
It's those two or none at all.
It was nice speaking to you, good luck with your hopes of buying a Winnebago.
A baseball player is blocking the soccer ball with his bat.
Someone is sitting in a room with no windows reading a book.