Problem:OPTIONS:
- mass migration
- metamorphosis
- spontaneous mutations
- by changing their density

Q: How do some animals change their depth? A:
****
A: by changing their density

Q: What are the two components of the autonomic nervous system? A:
OPTIONS:
- empathetic and sympathetic
- crystallisation and sympathetic
- neurons and sympathetic
- parasympathetic and sympathetic
parasympathetic and sympathetic

Q: What are most stis caused by? A:
OPTIONS:
- vaccines
- parasites
- viruses
- bacteria

Answer: bacteria

Question: Q: What substances dissociate into ions when dissolved in water? A:
OPTIONS:
- isotopes
- magnetic
- solvent
- ionic
Answer: ionic

input with options: Q: What layer of skin is located right beneath the epidermis? A:
OPTIONS:
- cusps
- scars
- humus
- dermis
output: dermis

Problem: OPTIONS:
- neutrons
- mass
- hydrogen
- energy
Q: Q: Every chemical reaction occurs with a concurrent change in what? A:
Answer:
energy