The illustration show a kind of animal that is free-living organism. what is the common name of this organism? (my class is live science, but it doesn't have an option)

First what are the options and life science is biology from the question it is flatworm but if that is not a option i am not sure but it would be planarian

Neptune is the eighth planet from the sun. it was the first planet to get its existence predicted by  mathematical calculations  before it was actually seen through a telescope on sept. 23, 1846. irregularities in the orbit of  uranus  led french astronomer alexis bouvard to suggest that the gravitational pull from another celestial body might be responsible. german astronomer johann galle then relied on subsequent calculations to   spot neptune via telescope. previously, astronomer galileo galilei sketched the planet, but he mistook it for a star due to its slow motion. in accordance with all the other planets seen in the sky, this new world was given a name from greek and roman mythology — neptune, the roman god of the sea.

No because scientist are still changing there mines today so they are not correct to this day