Without a control group there wouldn’t be any basis for knowing if a result is due to the variable being tested
A layer of ice on the surface keeps the water temperature warmer than the air temperature.
Decomposer hope this helps
Answer:
True
Explanation:
A sloping line on a speed-time graph represents an acceleration.
To calculate acceleration from a speed-time graph, you divide the change in velocity by the time taken for the change.
Energy is started from the sun, with 100 percent of the energy given to plants. when the plants are eaten, only 10% of that energy is given to the animal, like a rabbit. When the rabbit is eaten by a larger predator, only 10% is given of the rabbits energy. This continues, so to find the amount of energy within a certain organism you would need to calculate 10% from each original source of energy