Answer:
Ideally, the experimental and control groups are identical. As much as possible, the two groups should overlap in every characteristic.
Explanation:
At the beginning of your study, you need your two groups to be as statistically similar as is humanly possible. That way, when you control for other variables, you can reasonably attribute any statistically significant differences at the end of the study to your intervention.
The answer is A. It twirls like a helix and has 2 strands
Answer:
all i know is the one for the human population part shown in explanation by
ryuvrajsingh1298 ....
Explanation:
Population growth is also important because it affects the Earth's ability to withstand climate change and absorb emissions, such as through deforestation as land is converted for agricultural use to feed a growing human population. We are currently adding more than 80 million people a year to our global population.
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The older the rocks were the more like they were to have fossils.
Answer:
The answer is D
Explanation:
When absorbed energy is released back into space, Earth cools. Many factors, both natural and human, can cause changes in Earth's energy balance, including: Variations in the sun's energy reaching Earth. Changes in the reflectivity of Earth's atmosphere and surface.
