The doctor is a stranger or a step father?
Answer:
Contractile vacuole is responsible for maintaining the homeostasis in paramecium.
Explanation:
The observation of this experiment is that contractile vacuole is responsible for maintaining the homeostasis in paramecium because the contractile vacuole regulates the quantity of water inside a cell. Contractile vacuole controls the water balance in the body by absorbing and removing the excess amount of water out of the cell. This function of contractile vacuole allows the cells to survive under hypotonic stress that is present in the pond water or any other stressful environment.
This question is rather subjective: the answer depends on how the question is interpreted. Many people would say climate change is the greatest risk to water supply, but the question mentions 'Earth's water supply'. It is a fact that the amount of water on Earth has not changed. Climate change is shifting climatic patterns, so some areas experience more droughts, whereas others experience more floods, but the amount of water on Earth still stays the same. My answer is therefore that pollution poses the greatest risk to Earth's water supply. Pollution decreases the amount of water we can safely use without expensive treatment. Some water pollution, such as certain toxic metals, pesticides or endocrine disruptors, simply can't be detected or treated using conventional water testing and treatment. Modern civilisation is resulting in unsustainable amounts of pollution being released into our rivers and lakes, and sooner or later, a threshold of no return will be reached, where ecological collapse will mean we won't be able to rely on these water resources for fresh water anymore.