A. Earth
Geocentic, is a theory of Ptolemy. Where the Earth is the center of the solar system.
Volumes.
If you put equivalent volumes in a bag, where both weigh the same, the density might get equal.
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Answer:
Animals needs oxygen's to survive and plants need carbon dioxide to survive. The ozone layer reflects harmful UV rays from the sun to protect the things living on Earth.
The answer is: A. collecting data
During this process , researchers would use their observational skills and record every notable occurrence that happen to the variables.
The focus on this process is simply to add all relevant data without making any analyzation. That process come later on after the researchers started to change the variables in order to see whether it would create a correlation.
