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?

Monitor and apply fix up strategies

Easy 6th grade work! 100 points! i need fast! compare the parts of a cell and the cell as a whole to another common nonliving system (i.e., a car, a city, describe the parts of a cell and their primary function.

Monarch butterflies have brightly colored orange wings with black patterns on them, making them easily visible to birds that eat butterflies and moths, yet birds rarely eat the monarchs. likewise, the monarch caterpillars are brightly striped yellow and white and black, and they also are rarely eaten by birds, although some wasps will attack them and feed them to their young. what can be inferred from these observations? monarchs must threaten and attack birds, but not wasps. monarchs have a way of discouraging bird predation that does not involve hiding. monarchs’ wings are so colorful that most birds must find them difficult to eat. monarchs lay more eggs than other less conspicuous butterflies.