This guy will always delete my questions and answers... may i know why ?
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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

When will i get refunded for my cancelled subscription?

Missus a. having been sent b. going to send c. having sent d. sending