Gravity hold things together like trees and animals.
When objects floats on top of the water,gravity is still in play,pulling objects toward the Earth.
The moon ans stars and all the other planets are full of gravity.It aids in orbitation.
We usually don't feel gravity unless we try to overcome it,by either jumping or falling.
The Earth's tides are caused by the moon's gravitational pull on the oceans.
Isaac Newton wondered why the apple had fallen to the Earth,instead of just floating away.He came with the idea that some unseen force must attract,the apple towards the Earth.He named this force gravity.