Select the correct answer from each drop-down menu. The graph shows the change in Felix's hiking journey over time.

Based on the graph, determine whether each statement is true or false.

Felix's height is ascending at a constant rate during the first hour.
Felix's height is descending at a constant rate between hour 6 and hour 7.
Felix's height is ascending, then descending between hour 2 and hour 5.
Felix's height is descending at a constant rate during the last 3 hours of his hike.