2. To determine if the type of agar affects bacterial growth, a scientist cultures E. coli on four different types of agar. Five petri dishes are set up to collect results
. One with nutrient agar and E. coli
. One with mannitol-salt agar and E. coli
I
. One with MacConkey agar and E. coli
. One with LB agar and E. coli
. One with nutrient agar but NO E. coli

A. Independent Variable:
B. Dependent Variable:
C. Controls: