Fish sharks some types of dinosaurs
Answer:
Dumping Fuushima's Radioactive Water Into Pacific Ocean Is 'Only Option', Japan Says. On March 11, 2011, Japan was struck by the most powerful earthquake in the nation's history – a magnitude 9 temblor that triggered a tsunami with waves up to 133 feet (40 meters) high.
Explanation:
The amount of things that could harm them such as waste, other things trying to eat it, or their diet.
I agree on that. it's not like there is completely no force of gravity acting on them (I mean if they're still around the earth) , it's that it's so little that they can't even notice it. they'll float around and they seems like they have no weight. this is called weightlessness.