The independent (or manipulated)variable is something that the experimenter purposely changes or varies over the course of the investigation. The dependent (orresponding) variable is the one that is observed and likely changes in response to the independentvariable.
Answer:
The "Cambrian Explosion" refers to the sudden appearance in the fossil record of complex animals with mineralized skeletal remains. It may represent the most important evolutionary event in the history of life on Earth.
Explanation:
Answer:
Acid rain also known as acid deposition can come in any form of precipitation. It is basically precipitation with acidic components, such as sulfuric or nitric acid. It can come from sulfur or coal fumes.
It can be destructive to the ecosystem. Most animals aren't immune to the low pH levels and get harmed or die from it. The animals/plants that are immune suffer greatly by loss of food. You will most likely see dead plants and trees from the areas that have acid rain.
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