Q: Some reactions need extra help to occur quickly. they need another substance called what? A:

OPTIONS:
- neurotransmitter
- protein
- hormone
- a catalyst

Answer: a catalyst

Problem: OPTIONS:
- large nervous system
- autonomic nerous system
- somatic nervous system
- central nervous system
Q: Q: The peripheral nervous system consists of all the nerves that are found outside what? A:
Answer: central nervous system

Problem:OPTIONS:
- medium
- too high
- low
- very high

Q: Do tropical regions have very high or very low rates of immigration? A:
****
A: very high

Q: In vertebrates, a system of what structures attached to the endoskeleton enables movement? A:
OPTIONS:
- nerves
- tendons
- tissues
- muscles
muscles

Q: What element has an atomic number of 6? A:
OPTIONS:
- silicon
- oxygen
- hydrogen
- carbon

Answer: carbon

input with options: Q: Terrestrial arthropods generally have internal surfaces specialized for what? A:
OPTIONS:
- water uptake
- food gathering
- protection
- gas exchange
output:
gas exchange