Which of the following is an example of gene flow?
1.A forest fire kills 50 percent of red-spotted chipmunks in a forest community.
2.Pollen from a yellow daisy travels across a stream and pollinates an orange daisy.
3.A bird with blue feathers is less camoflaged in the rainforest than a bird with green feathers.
4.Mice with heavy coats are able to survive the winter better than mice with thin coats.
