Oxygen makes up nearly 20% of the atmosphere. Use the following information to calculate the residence time of oxygen in the atmosphere. Mass of oxygen in atmosphere = 1.4 million gigatonsMajor sources of oxygen to atmosphere:Photosynthesis by plants on land = 125 gigatons/yrPhotosynthesis by plants in ocean = 155 gigatons/yrMajor sinks of oxygen from atmosphere:Respiration by animals = 220 gigatons/yrBacteria = 50 gigatons/yrBurning of fossil fuels = 10 gigatons/yr

Researchers conducted an experiment to identify the effects of three different hand sanitizers on the growth of bacteria. the researchers grew one type of bacteria in twenty-four identical covered petri dishes. then, they opened eighteen petri dishes and applied the three hand sanitizers to six petri dishes each. they left the remaining six petri dishes closed as a control group. when the researchers measured the growth of bacteria two days later, the six dishes that had no hand sanitizer showed the least amount of bacterial growth. the researchers concluded that not using any hand sanitizer would lead to the least bacterial growth. which statement best explains why the researchers’ conclusion was not justified? the experiment tested too many variables. the control group was not treated the same as the experimental group. the sample size of twenty-four petri dishes is not large enough. the single type of bacteria is not adequate to make any conclusions.