Whales, birds, snakes, and fish need oxygen to survive. Even though they share this trait, these animals are not related because
they do NOT — A. inherit genetic instructions passed down from the same parents.
B. lives in the same type of environment.
C. eat the same types of food.
D. need oxygen to survive in their environments.
Therefore, when an experiment shows that one variable makes another variable change, and no other variables have any effect, the experiment shows causation.
