Watch the video about hardy and Weinberg who determine the conditions that must be true if evolution will not occur

Imagine that someone pushes one marble toward a motionless marble. would there still be action-reaction forces involved in the collision? how might the marbles’ motions be changed? ?

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

Achild has maximum walking speed of 1.6 m/s. what is the length of the child's legs? 0.26 m