A colleague of Dr. Farah's questions the internal validity of her causal claim. He is curious as to whether the relationship between homework and academic achievement could be explained by interest in one's classes. Specifically, he thinks that students who are interested in their classes will both do more homework and have higher GPAs. Which of the following is a solution to this possible threat to internal validity?
A. Dr. Farah should measure students' interest in their class instead of GPA.
B. Dr. Farah should also measure students' interest in their class.
C. Dr. Farah should study a different sample.
D. Dr. Farah should measure students' interest in their class instead of time spent doing homework.

You are a member of the jury for a murder case. the prosecution has presented dna evidence linking the defendant to the crime scene. the defense claims that dna evidence using str analysis with 13 markers is not sufficient to reliably distinguish between people. what do you think? a. the defense is right. str analysis with 13 markers gives a 1 in 1 million chance of two people having the same pattern, leaving a reasonable doubt. b. str analysis is not sufficient. the defendant's entire genome should be sequenced. the prosecution will have to consult a genomic library to make sure their dna evidence is valid. c. the prosecution is right. str analysis with 13 markers gives a 1 in 10 billion or greater chance that two people will have the same pattern. this person was at the crime scene. d. dna evidence is not generally accepted by legal experts.

Plz plz i need i don’t want to fail plz me don’t let me fail i need on a 4 paragraph about how tighter british control led to a revolution in colonial america

Why is it necessary to obey social norms? write briefly.