You are presented with the quiz "What can cause lakes to form?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "damming a river can cause a lake to form" and "beavers build dams".   So, what's the best answer to the question?

Answer: beavers


You are presented with the quiz "What does fertilizer supplement?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "most plants grow roots down into the soil to absorb water and minerals" and "fertilizers supplement the roots with nutrients drawn from the soil".   So, what's the best answer to the question?

Answer: nutrients


You are presented with the quiz "Asteriods are often pulled into the planet Jupiter by what force?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "gravity causes objects that have mass to be pulled down on a planet" and "asteroids Asteroids are variously-shaped masses of rock, metal, and ice".   So, what's the best answer to the question?

Answer: Gravity


You are presented with the quiz "What may cause animals to fight towards members of their own species?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "competition may cause animals to fight towards members of their own species" and "competition Animals compete for food and shelter".   So, what's the best answer to the question?

Answer: