Students filled up five test tubes with milk, which contains lactose sugar. They added methylene blue, which is an oxygen indicator to each test tube. The students left one test tube without yeast. They put 2ml of yeast, 3ml yeast, 4ml of yeast and Sml of yeast in the next 4 test
tubes. They timed how long it took for the yeast to deplete the oxygen in each test tube.
What is the independent variable in this experiment?

it takes hundreds of years to become stable.

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he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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they have identical fossils of organisms that have evolved over time.

both have animal fossils preserved in them due to weathering and erosion.

they contain different fossils because life on earth has changed through time.

the fossils in them were formed on the surface of earth due to exposure to sunlight.