I'd draw a car on a hill and explain how you press the gas pedal and gravity helps push the car down the hill, or draw it going up the hill and explain how gravity makes it difficult for the car to make it up the hill.
Answer:
The answer is B. Mergus serrator and Mergus merganser
Explanation:
- <u><em>They are ducks and they are closley related.</em></u>
It is called coevolution, when two species influence each other's speciation.
