Answer:
They use a control group.
Hope this helps :)
Answer:
I need more info to the problem
According to the context, the correct sentence with the irregular verb in the imperfect tense is <em>¿</em><em>veías</em><em> a tu padrastro todos los días?.</em>
<h3>What is the imperfect tense?</h3>
It refers to actions with a certain duration in the past or that were carried out simultaneously with other actions.
As with other verb tenses, there are rules for conjugating verbs in the imperfect tense in Spanish, where the ending of the verb will change depending on the subject of the sentence and the original ending in the infinitive.
However, the verb ''ver'' has an irregular verb conjugation and is pronominal, so it will not follow the regular verb conjugation rules.
Therefore, we can conclude that according to the context, the correct sentence with the irregular verb in the imperfect tense is <em>¿</em><em>veías</em><em> a tu padrastro todos los días?.</em>
Learn more about the imperfect tense here: brainly.com/question/12112915
Electromagnetic waves can travel through all types of waves.
