How planktons float on water?

This floats on water

Seeds that float on water

Watermelon sink or float in water?

Why do seeds float on water?

Which objects sink in kerosene but float on water ?

Why do some objects float on the water ? And some sink ?

Iron nail sinks in water. Empty iron tin box floats on water. why?

We know that a ship, even though it is made up of tonnes of iron, floats on water. How do you feel about the scientists who found the scientific principles and efforts in making a ship?

Why does the wooden block float on water even though it is heavier than a marble ?