Please answer this: Rob is a biologist who is interested in native species conservation. To that end, he conducted two studies, case A and case B. In case A, a non native apex predator C was introduced in formerly apex predator D's habitat. In case B, same non native apex predator C was removed from formerly apex predator D's habitat. He now needs to analyze the results of these studies. In which case predator D's trophic level would decrease, case A or case B?
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Answer: case A
Problem: Two sisters went to the hospital. The medics ran some blood tests and found out that Sue had sickle cell trait, while Mary had normal blood cells. Sue received treatment. Which sister doesn't have hemoglobin S in her blood?

A: Mary
Problem: Given the question: Rob is a chemist with a pharmaceutical company. He is trying to devise a technique that would be able to control chemical reactions. For that, he conducted two tests. In the first test, he used warmer reactants. He called it reactant A. In the second test, he used cooler reactants. He called it reactant B. In which reactants the particles would collide with greater force, reactant A or reactant B?
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The answer is:
reactant A
input question: Greg is a physician working for the city hospital. Today he is seeing two patients, patient A and patient B. He noticed that patient A's blood vessels are constricted, but blood vessels of patient B are dilated. He needs to prescribe medicine according to his observation. Would patient B's blood vessels be narrower or wider than patient A's????
output answer: wider
Mary had two twin daughters, Mimi and Coco. Coco was healthy, but Mimi had hemophilia. Mimi took frequent trips to the doctor's office. Which girl experienced a higher risk of internal bleeding?
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Answer: Mimi
Q: Nicholas works in pest control, and needs to have a steady supply of nitrogen gas for his tools. He always keeps a closed container of nitrogen gas in his freezer, where the temperature is very low. Nicholas's neighbor, Justin, likes to grill in his backyard. Justin, therefore, always keeps a closed container of propane gas outside, where the temperature is high. Molecules of which gas will collide against the walls of their respective container with more force?
A:
propane gas