The correct answer form what I think should be c I apologize if not
Answer:
One fertilizes the egg, and the other combines with the two polar nuclei.
Explanation:
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>
One constant kept in this experiment is the amount of food available to the larvae.