Which simple machine is not correctly matched with an appropriate task for its use?

a lever: removing a nail from a board
an inclined plane: moving a heavy box up to the second floor of a building.
a wedge: splitting a log
a pulley: lifting a heavy box and moving it across a room

According to social exchange theory, altruistic behaviors benefit the individual who performs them.

Which best represents the law of conservation of mass ?

Utah's great salt lake has an average salinity seven times higher than that of the oceans. very few multicellular organisms live in this harsh environment. an example is the brine shrimp, which must devote a large portion of its metabolic energy to osmoregulation. these brine shrimp must available hint(s)utah's great salt lake has an average salinity seven times higher than that of the oceans. very few multicellular organisms live in this harsh environment. an example is the brine shrimp, which must devote a large portion of its metabolic energy to osmoregulation. these brine shrimp must pump water back into their cells to counter its loss due to osmosisactively pump water back out of their cells to counter its inflow due to osmosissynthesize membranes that are impermeable to substances that upset osmotic balanceactively pump salt back out of their cells to counter its inflow due to osmosis