A “flight or fight” response occurs when the body perceives a type of threat. The hormone known as adrenaline is released which will affect a variety of body systems. Which system needs to increase its activity in order for the muscular system to respond to the perceived threat? A)Endocrine
B)Integumentary
C)Excretory
D)Digestive

How does pregnancy begin? a) a placenta forms in the uterus b) a sperm reaches an egg in the fallopian tubec) the blastocyst differentiates into two cell types d) contractions begin in the uterine wallapex

Which of the following is a way that minerals are used? a. industry construction technology d. all of the above

Ricardo notices that when he plays soccer in the rain, his ball does not seem to go as far after a kick. what is the best scientific question that ricardo could ask about this observation? is soccer better played in the rain or sun? how does rain affect the distance a soccer ball can travel? how does rain affect the speed of a soccer ball? is soccer affected by the rain?