Three characteristics that are unique to mammals include their  ability to feed their babies with milk made in their mammary  glands. Mammals also have hair on their bodies â¦and they have a  single bone that makes up their lower jaw.
buoyancy. n. 1. the ability to float in a liquid or to rise in a fluid. 2. (General Physics) the property of a fluid to exert an upward force (upthrust) on a body that is wholly or partly submerged in it. 3. the ability to recover quickly after setbacks; resilience.
Upthrust is a type of force that pushes things upwards. e.g. When an object is immersed in water the object experiences upward force from the water, which is called upthrust.â¦ OR.The upward force exerted on a body by the fluid in which it is submerged is called upthrust or buoyant force.t is when an object floats due to balanced force between upthrust of the fluid (pushing upwards) and weight of the object (pushing downwards). 1 person found this useful. Edit. Share to: 1  The Periodic Table of Elements Life is sustained by a number of chemical elements.