Answer: Option B
Explanation:
Usually in scientific experiments, at least one parameter is checked; here, the growth rate of wheat in two different conditions is being evaluated.
Hence, growth rate of wheat alone in pans A, B and C becomes the standard or referential control against which the experimental control (Wheat + clover) in pans D, E and F is evaluated, since both treatments are exposed to the same external conditions.
I hope this helps
The roots of the trees keeps the soil in place
Answer:
the answer is D ecosystem
Answer:
The squirrel, robin, and field mouse
Explanation:
A producer is what gets its energy directly from the sun (usually a plant) and the squirrel, robin, and field mouse all eat the plant seeds, which get energy from the sun .
