Id 5603642259 pass 123456

z o o m class​

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

These two elements threaten ecosystem biodiversity.

The children built a sand castle near the water.