Q: What is the process where light bounces back from surfaces that it cannot pass through? A:

OPTIONS:
- diffraction
- direction
- absorbtion
- reflection

Answer: reflection

Problem: OPTIONS:
- acids
- axons
- enzymes
- hormones
Q: Q: What are the "chemical messenger" molecules used by the endocrine system? A:
Answer: hormones

Problem:OPTIONS:
- transition
- structure
- transfusion
- solution

Q: What do you call a type of mixture that has the same composition throughout? A:
****
A: solution

Q: What bodily substance is formed from cells, and in turn helps make up organs? A:
OPTIONS:
- tendons
- muscles
- ligaments
- tissues
tissues

Q: What phenotype do gain-of-function mutations usually result in? A:
OPTIONS:
- submissive
- internal
- external
- dominant

Answer: dominant

input with options: Q: What term describes motion that repeats itself at regular time intervals, such as exhibited by a vibrating guitar string? A:
OPTIONS:
- gravitational pull
- specific speed
- apparent motion
- periodic motion
output:
periodic motion