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What symptom does OPQRST help a rescuer to assess?

How might an evolutionary biologist explain why a species of salamander becomes blind after colonizing a cave?

Which of the following statements, regarding the process of science, is true? 

Which of the following is an objective finding?

What should you do after a primary survey in which you did NOT determine that a potentially catastrophic injury was present?

Echinacea is an herbal supplement that is often used an over-the-counter cold remedy. A team of scientists decided to investigate its effectiveness. They hypothesized that echinacea reduces the effect of the common cold on the body because it boosts the ability of the immune system to fight off the virus. The images below report the experimental design and the results. Based on this information, choose the best conclusion for the study from the provided options.

An objective finding that can be seen, heard, felt, smelled, or measured

Dr. Thistle wanted to test Dr. Garnet’s experiment but could only access a single tree with emerald ash borer infestation. Dr. Thistle injects the tree with the insecticide and then determines the percent of larvae killed. Dr. Thistle then reintroduces the emerald ash borer to the tree and repeats the experiment 49 more times. Is this experimental design valid? 

Refer to the image. On the left, there is a set of graphs that show frequencies of different alleles for two traits in a population in the first generation (different bars represent different alleles). On the right are labeled graphs representing the frequencies of those alleles for the same traits in the second generation. Which of the sets of graphs demonstrate(s) evolution of beak size but not evolution of tail size?   

Adaptations can result from which of the following evolutionary force(s)?