Answer:
The control sample is those sample that is used in the experiment to guarantee that the examination of the experiment is done properly and the results that are obtained are reliable.
These samples are an important component of the quality assurance that is used in order to prevent any inaccuracy of the laboratory results.
Explanation:
levels of the carbon dioxide in the atmosphere rise and fall each year as plants through photosynthesis and respiration take up the gad in the spring and summer and release it in fall and winter. Now the range of that cycle is expanding as mire carbon dioxide is emitted from burning fossil fuels and other human activities
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Water is the correct answer
Answer:
Explanation:
It takes 27.3 days for moon to make one revolution this is called sidereal month and it takes 29.5 days to complete a cycle of phase this is called synodic month. The synodic month is difference is because as the moon moves around earth, the earth is also moving round the sun. Hence, the moons needs to move farther away to make up the distance that was added as the earth also revolves in other to complete the cycle.
It's to maintain suitable conditions for life
