Q: To which organ system do the esophagus, liver, pancreas, small intestine, and colon belong?

OPTIONS:
- reproductive system
- excretory system
- digestive system
- endocrine system
A: digestive system
Q: Which behavior is an example of an animal adapting to a change in the environment?

OPTIONS:
- a squirrel climbing a tree
- a rabbit feeding its young
- a frog eating an insect
- a bird migrating south
A: a bird migrating south
Q: Which body system is most affected by a disease that causes the bones to become weak and brittle?

OPTIONS:
- excretory
- muscular
- skeletal
- nervous
A: skeletal
Q: A student wants to look under a heavy rock. Which simple machine would be BEST to use to lift the rock?

OPTIONS:
- Wheel and axle
- Lever
- Inclined plane
- Screw
A:
Lever