What is the activation energy of a chemical reaction? a
b
Chemical bonds are formed to begin a reaction,
Chemical bonds do not change to begin a reaction.
Chemical bonds are broken to begin a reaction,
Chemical bonds are added to begin a reaction.
С
Od

That would be the corect answer hope this

Wooden , walls ,doors ,support

You need to be more specific.  i really don't know what a "motion map" is.you can draw a graph of an object's position, distance, displacement, speed,velocity, or acceleration versus time, or you can draw a graph of the object's x-position versus its y-position and not give any information about time at all.if the graph presents position or displacement against time,  then constant velocity is a straight line . . i.e. a line that has  constant slope.if the graph shows speed against time, then constant velocityis a horizontal piece of line.if the graph shows acceleration against time, then constant  velocity is a piece of line that lies on the x-axis . . it's value is zero.