mobile, the opposite (antonym) is sessile.
Plenty of animals are sessile, meaning attached to something like a plant. They include sponges, anemones, corals, barnacles, and sea squirts. Their larva larvae do swim around, though corals can reproduce by budding.
because it is white and blends in with its suroundings
Being in free fall is much like being underwater, in that you float freely. To move around in such an environment, you have to hold on to things, since you are not held in place by gravity.
because they move their body parts freely
Yes, it's called a Sandbox game, and you can basically freely travel around the mall.
they move freely around
protons????
sting rays adapt to their new environment they can go under the sand because it is not adapted to the new environment. in other ways stingrays just swim freely
Because it is freely available and it doesn't damage the environment.
An aquifer transmits ground water freely.
electron
They move around freely!!