Natural-born Runners - Marvel Education

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Practice Reading: Fill in the Blanks (Dropdown) ID: #50009 Natural-born Runners

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You've probably had the feeling. Your running shoes are pounding the pavement then suddenly your pain fades away, and you're feeling euphoric. The runner's high. But that biological perk may be limited to mammals that evolved for endurance like us. So says a study in the Journal of Experimental Biology. Researchers had humans and dogs both natural-born runners jog a half hour on a treadmill. Then they sampled their blood for endocannabinoids, some of the thought to trigger the runner's high. As expected, humans and dogs had much higher levels after the run. But when ferrets a species took the same 30-minute trot, they had no spike in those molecules. The authors say that's because long-distance running could have helped our hunter-gatherer ancestors find more food thus increasing their reproductive success. And they speculate that natural selection may have linked up a feel-good reward to that beneficial . These days of course, this ancient trait won't help us find extra calories but it may encourage us to run 'em off.

Result:

A.I. Explanation:

Correct answer: exercise
Explanation: The word 'exercise' fits grammatically as a noun that describes the activity associated with endurance, aligning contextually with the discussion about mammals that evolved for endurance activities. It is the only option that directly relates to physical activity, which is the focus of the sentence.
Meaning: 'Exercise' refers to physical activity that is done to improve health and fitness, particularly relevant in the context of running and endurance.
Wrong options:
dykes: The term 'dykes' refers to embankments or barriers and is unrelated to the context of physical activity or endurance.
personalize: 'Personalize' is a verb meaning to make something personal or tailored to an individual, which does not fit the context of endurance activities.
classifies: 'Classifies' is a verb that means to categorize or arrange into classes, which does not relate to the concept of endurance or physical activity.
Correct answer: compounds
Explanation: The word 'compounds' is a noun that refers to substances formed from two or more elements, fitting grammatically and contextually as it describes the endocannabinoids being measured in the study. It aligns with the scientific context of the sentence.
Meaning: 'Compounds' refers to substances made up of two or more elements or ingredients, particularly in a scientific context, such as the endocannabinoids mentioned in the study.
Wrong options:
almshouse: An 'almshouse' is a type of housing for the poor, which is irrelevant to the context of biological substances or the runner's high.
turnarounds: 'Turnarounds' refers to a change in direction or a reversal, which does not fit the context of biological compounds or substances being measured.
foxhounds: 'Foxhounds' are a breed of dog used for hunting, which does not relate to the scientific discussion of endocannabinoids.
Correct answer: sedentary
Explanation: The word 'sedentary' is an adjective that describes a species that does not engage in much physical activity, fitting grammatically and contextually as it contrasts with the active nature of humans and dogs in the study.
Meaning: 'Sedentary' means characterized by a lack of physical activity or movement, particularly relevant in describing ferrets in this context.
Wrong options:
excellency: 'Excellency' is a title of respect or honor, which does not fit the context of describing a species' activity level.
merely: 'Merely' is an adverb meaning only or just, which does not describe a species and is not relevant in this context.
faerie: 'Faerie' refers to a mythical being or fairy, which is unrelated to the biological context of the sentence.
Correct answer: feel-good
Explanation: The term 'feel-good' is an adjective that describes molecules associated with positive feelings, fitting grammatically and contextually as it directly relates to the endocannabinoids that trigger the runner's high.
Meaning: 'Feel-good' refers to something that induces positive emotions or sensations, particularly relevant in the context of the molecules being discussed.
Wrong options:
groaned: 'Groaned' is a verb that means to make a low sound of pain or discomfort, which does not fit the context of describing molecules.
inchoate: 'Inchoate' is an adjective meaning just begun and not fully formed, which does not apply to the context of positive emotional molecules.
loaned: 'Loaned' is a verb meaning to give something temporarily, which is irrelevant to the context of describing molecules related to feelings.
Correct answer: behavior
Explanation: The word 'behavior' is a noun that describes the way in which one acts or conducts oneself, fitting grammatically and contextually as it relates to the actions of hunter-gatherer ancestors in the context of running and survival.
Meaning: 'Behavior' refers to the way in which one acts or conducts oneself, particularly in response to environmental stimuli, relevant in the context of evolutionary traits.
Wrong options:
wager: A 'wager' is a bet or gamble, which does not fit the context of actions related to survival or running.
exchanger: 'Exchanger' refers to something that exchanges or swaps, which is not relevant to the context of behavior in evolutionary terms.
regulator: 'Regulator' refers to something that controls or maintains a system, which does not fit the context of describing actions or behaviors.

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