What three things happen when air is warmed?

it expands
it contracts
it becomes lighter
it becomes heavier
it rises
it sinks

The respiratory system removes oxygen and water from the body. select the best answer from the choices provided t f

Aperson gives a shopping cart an initial push along a horizontal floor to get it moving, and then lets go. the cart travels forward along the floor, gradually slowing as it moves. consider the horizontal force(s) on the cart while it is moving forward and slowing. which of the following statements is correct? (a) both a forward and a backward force are acting on the cart, but the forward force is larger. (b) only a forward force is acting which diminishes with time. (c) both a forward and a backward force are acting on the cart, but the backward force is larger. (d) only a backward force is acting, no forward force.

What organization and environment is described above?