input: OPTIONS:
- pressure
- resistance
- density
- current Now, answer this question: Q: A switch in a circuit controls the flow of what, specifically, within the circuit? A:
A:
output: current

Q: What is the nervous tissue in the brain and in the rest of the nervous system made up of? A:

OPTIONS:
- electrons
- plastic
- ions
- neurons

Answer: neurons

Problem: OPTIONS:
- muscular system
- reproductive system
- digestive system
- urinary system
Q: Q: Kidney stones are considered a disease that affects which system? A:
Answer: urinary system

Problem:OPTIONS:
- rivers
- creeks
- grasses
- lakes

Q: What do craters and rifts become when the fill with water? A:
****
A: lakes

Q: What makes echinoderms force water into the feet and move forward? A:
OPTIONS:
- spring contractions
- vacuum contractions
- field contractions
- muscle contractions
muscle contractions

Q: What type of molecule is first broken down in cellular respiration? A:
OPTIONS:
- oxygen molecule
- hydrogen molecule
- fructose molecule
- glucose molecule

Answer:
glucose molecule