According to the "bulb perennials through the seasons" graphic, when does the fourth stage of bulb growth take place?                 a.  february-march      b.  november      c.  september-october      d.  july-september

What is a loop? a. a collection of function definitions at the top of a program b. a line of code that defines a variable and assigns it a value c. a program that opens the turtle graphics window d. a block of code that repeats a specific number of times