The mixing and separating actions been performed here involves the options selected, because before their can be separation there has to be some kind of mixing involved .
Removing seed casings from grains : as a grain crop grows and reproduces its produce which is the grain is attached to a casing that hold the seeds together( mixing ) therefore removing the casings from the grains ( separating ) is an example
Removing salt from seawater; At sea the water is mixed up with the salt content found/deposited at the bottom of the sea ( mixing ) removing the salt from the seawater ( separating ) is an example as well
water is made up of hydrogen and oxygen ( mixing ) decomposing water into oxygen and hydrogen is a form of separation
soda bottle bubbling when it is open is separating the gases used while producing the soda
copper is an element and not a compound so no mixing is involved
