Problem: Given the question: I read this background article the other day: As for the public health or food safety concern, organic foods are intended to be healthy, free of contaminations and free from agents that could cause human diseases. Organic milk is meant to have no chemical residues to consumers, and the restrictions on the use of antibiotics and chemicals in organic food production has the purpose to accomplish this goal. Although dairy cows in both organic and conventional farming practices can be exposed to pathogens, it has been shown that, because antibiotics are not permitted as a preventative measure in organic practices, there are far fewer antibiotic resistant pathogens on organic farms. This dramatically increases the efficacy of antibiotics when/if they are necessary.  I am facing a new situation today: Two farms were growing food for several nearby cities. Vole farm grew organic produce and produced organic milk, while Anthill farm did not possess the USDA organic certification.  Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Which farm had more antibiotic resistant pathogens?
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The answer is:
Anthill


Problem: Given the question: I read this background article the other day: Old age begins in the mid-60s and lasts until the end of life. Most people over 65 have retired from work, freeing up their time for hobbies, grandchildren, and other interests. Stamina, strength, reflex time, and the senses all decline during old age, and the number of brain cells decreases as well. The immune system becomes less efficient, increasing the risk of serious illnesses such as cancer and pneumonia. Diseases such as Alzheimer’s disease that cause loss of mental function also become more common.  I am facing a new situation today: Doctor Brown examined two groups of patients: Group O, with members over 65, and group P, with members under 65 years of age. The study was about the effects on aging on the human body.  Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Which group has more people with declining stamina?
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The answer is:
Group O


Problem: Given the question: I read this background article the other day: Protozoa generally feed by engulfing and digesting other organisms. As consumers, they have various roles in food chains and webs. Some are predators. They prey upon other single-celled organisms, such as bacteria. In fact, protozoa predators keep many bacterial populations under control. Other protozoa are herbivores. They graze on algae. Still others are decomposers. They consume dead organic matter. There are also parasitic protozoa that live in or on living hosts. For example, the protozoan that causes malaria lives inside a human host. Protozoa are also important food sources for many larger organisms, including insects and worms.  I am facing a new situation today: The students studied two ponds. Class A studied a pond filled with protozoa, while class B studied a pond with almost no protozoa.  Using the knowledge I acquired from the background article, how should I answer correctly the following question regarding my new situation: Which class observed less engulfing and digesting of other organisms?
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The answer is:

class B