A science class is tracking the progress of plant growth. The classstarts the experiement with a plant 5 cm tall. The plant grows 2 cm each day. The model for plant growth "y" is given by: y=2x+5. What is the meaning of the y-intercept in this equation? a. The y-intercept is the starting date. b. The y-intercept is the growth rate of the plant. c. The y-intercept is the starting height of the plant. d. The y-intercept is the largest height the plant can grow.