Trina and Shannon study monkey behavior and are specifically interested in assessing how comfortable monkeys are around human observers. They individually conduct their observations on two groups of monkeys: one group that sees an observer wearing a mask and another group that sees an observer not wearing a mask. They want to see if masks impact how comfortable the monkeys are around the human observers. Every time Trina goes to observe her group without her mask on, she gives each of the monkeys a special treat before she observes them. What type of threat to internal validity might be going on in this scenario

If an atom has 35 protons in the uncles , how many elements will it have orbiting the nucleus

This form of government has only a single political party. question 2 options: communist democratic autocratic parliamentary

Awoman was found strangled in the basement of her home where she lived with her husband. the crime scene was processed and investigators left. the next day, the medical examiner reported that a scalloped, woven belt was used to strangle the victim. the police asked the husband to search the house again to look for such a belt and he agreed. a belt was found that matched marks on the victim. the man was arrested. his attorney made a motion that the belt be excluded from the evidence as he contended that the search was not legal. which statement is true? a. the belt should be excluded because the search was not legal. the police did not obtain a search warrant, as needed according to the fourth amendment to the u. s. constitution. b. the belt is admissible because the man gave his consent to the second search. c. the belt should be excluded because the search was not legal. the police did not obtain a search warrant, as need according to michigan v. tyler. d. the belt is admissible as evidence, according to mincey v. arizona.