No system is completely closed off from its surroundings. Which example represents a system that is almost completely closed?
O a wood-burning fireplace
an uncapped soda bottle
a capped thermos
a pot of boiling water
2.
3

come closer and become far apart and become steam/gas

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19