A blob of water in water doesn't sink when its weight * equals its bouyant force.
*is zero.
*is greater than its bouyant force.
*is less than its bouyant force.

be subject to a force andchange its motion

the skeletons of most mammals reach a certain size and then stop growing. however, many animals, including some mammals, keep growing throughout their lives. kangaroos, for example, just keep growing and growing until they die. also, the longer an animal lives the greater the chance it might catch some deadly disease.

it is a negative acceleration