Amanda is studying the growth of a particular type of plant. She is testing the effects of four growth factors: lighting, age, temperature, and humidity. Here are the levels she's testing for each. Growth factor Levels Lighting None, Low, Medium, High, Very high Age 1 month, 2 months, 3 months, 4 months, 5 months Temperature 20 C, 22 C Humidityr Low, Medium, High She wants to nd the number of ways of combining one level from each of the growth factors. How many ways are there