Which variables are being controlled in this experiment? (Select the 3 that apply)
a) Moisture availability (how much water is in the soil).
b) Soil content (what is actually in the soil).
c) Seed viability (if the seed is able to grow and live).
d) The color of light (red, orange, green, blue, violet).
a) Moisture availability (how much water is in the soil).
b) Soil content (what is actually in the soil).
c) Seed viability (if the seed is able to grow and live).
d) The color of light (red, orange, green, blue, violet).