Mountain Bike is the correct answer
Three variables can be used .
1. Sun 2. Moon 3. Earth
These are suggestions that lizzie can control:
1.<span> Discover how long the Earth takes to orbit the Sun
2. how many hours it takes the Earth to spin around once on its own axis, 3. how long the Moon takes to orbit the Earth</span>
Answer:
adenine (A), cytosine (C), guanine (G), and thymine (T),
Explanation:
