Producers are typically plants, so I believe the correct answers would be 2, 3, 4.
Answer:
For example, if the seeds that the bird needs to eat is bigger, over time it will adapt to get a bigger beak to eat the bigger seed. The birds that have adapted reproduce and soon more and more birds that have a bigger beak for the bigger seed are more common. If the type of food available changes than the bird will most likely adapt to eat that food.
Maybe its because males are more stronger than females specially physically than females
