The purpose of the question is to properly identify the tense of the verb being used. For this case, we use context clues to infer that the verb is being used in the present tense and will answer accordingly.
From the sentence given, we can use the word "está" as context to determine the tense of the verb. "Está" is used in the present tense. The other ways to use this word are:
- "Estuvo", signals a past tense of a verb will follow.
- "Estara", signals that a future tense of a verb will follow.
The fact that the previous word is being used in the present tense allows us to infer that the verb will be used in the present tense as well. Therefore, we choose the present tense of the verb "visitar" which corresponds to "visitando" and fill in the blank with this word.
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The ability to generalize a study's results to different circumstances is known as external validity that suffers from 7 types of threats.
<h3>What are the threats to External Validity?</h3>
There are 7 major threats to external validity.
- The first threat is sampling bias, in which a sample is not representative of the population.
- The second threat is history, where an unrelated incident can affect the results.
- The third threat is observer bias, in which the traits or actions of the experimenter unintentionally affect the results, resulting in bias and other demand features.
- The fourth threat is the Hawthorne effect, which describes the propensity for individuals to alter their behaviour merely because they are aware that they are being observed.
- The fifth threat is the Testing Effect, in which the results are impacted by whether a test is administered before or after another.
- The sixth threat is the aptitude-treatment, which involves the interaction of individual and group factors to affect the dependent variable.
- The environment, time of day, location, researcher traits, and other variables that restrict the generalizability of the results are included in the seventh threat.
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Answer:
S wave, P wave, Surface wave.
Explanation:
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