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47. a student is frightened by a loud noise, which results in a hormone being released into the blood. the hormone causes the student's heart to beat rapidly. the two systems that work together to cause this reaction are the endo- crine system that secretes the hormone and the (1) nervous system (3) excretory system (2) reproductive system (4) digestive system

Which statement best describes the development of ideas in "sonnet 91"? the quatrains build ideas off of one another, and the couplet conveys a new idea. the quatrains contradict one another, and the couplet resolves their disagreement. the couplet agrees with the idea in the first quatrain but contradicts the others. the couplet builds off of the idea of the third quatrain but contradicts the others.

Which of the following is an essential element of a strong informative/explanatory text? a. it expresses an opinion on a topic. b. it has a clear organizational structure. c. it uses text features, such as headings. d. it includes graphic elements, such as images.