Chemical X was used widely in the United States as an insecticide for many years. Eventually, research showed chemical X was a persistent chemical that bioaccumulated and biomagnified in the environment. The chemical was later banned from use in the United States. You are writing a report on the history of chemical X in the United States. Your instructor says that all sources used for your report must be primary sources. Which source would you choose? a. an interview with the scientist who created chemical X.
b. a textbook from an environmental toxicity class.
c. a news website story about chemical X
d. an original research article in a scientific journal about the effects of chemical X.

Which of the following is a testable hypotheses?

Can someone pretty me with this ? it’s urgent.compare the three theories of emotion. here are the three theories of emotion. cannon-bard theory of emotion: the belief that both psychological arousal and emotional experience are produced stimultaneously ( at the same time) by the same nerve stimulus. james-lange theory of emotion: the belief that emotional experience is a reaction to bodily events occurring as a result of an external situation. ( “ i feel sad because i am crying.) schachter-singer theory of emotion: the belief that emotions are jointly determined by a nonspecific kind of psychological (bodily function) arousal and its interpretation, based on environmental ( natural surroundings) cues. which of these theories makes most sense to you? why. your response should be written using proper english spelling and grammar. and it needs to be 10 complete sentences.

Which of the following determines the specificity of a dna probe? a. type of radiation b. level of enzymatic activity c. number of neutrons d. complementary base pairing