An engineer wants to build a bridge made of concrete and steel. The bridge needs to be able to withstand forces like tension, comprension and stretching.

Which mechanical properties of the materials to be considered?

strength and elasticity
elasticity and density
flexibility and elasticity
strength and hardness

There are few cells in the body that do not undergo mitosis: most somatic cells divide regularly, some more than others. take for example the cells that line the digestive tract. these cells must be frequently replaced because they are constantly eroded by the movement of food through the tract. what mechanism(s) is/are in place to ensure that these cells are exact copies of the mother cell