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A species of spruce tree occupies the same niche at the mouth of a river that a species of pine tree occupies further upstream. One year, several pinecones fall into the
river and are carried to the mouth, where they take root and grow amongst the spruce trees. What will be the most likely result of this occurrence?

- The pine trees will extend their roots away from the spruce trees.
- The pine trees and spruce trees will coexist at the mouth of the river.
- The spruce trees will gradually begin to grow on the opposite bank of the river.
- Either the pine trees or the spruce trees will eventually die off.