Question

predators can effect changes in the traits of their prey and vice - versa
the phenomenon you observed between populations of crossbills and pinecones is called coadaptation. in areas where only crossbills are the main predators, the pine trees have adapted to bird predation by producing heavier cones with thick scales. faced with this additional defense, the crossbill population, over time, developed deeper beaks. (see bird on the right) to become more fit for survival. in short, the population of crossbills had coadapted to the tree’s new defense.
which of the following is true of coadaptation in this scenario?
○ adaptations made by one organism exert a pressure on a closely interconnected organism to develop counter adaptations or traits to survive.
○ coadaptations always come about through a predator forcing a prey population to change their trait.
○ coadaptations always come about through a prey species forcing a predator to change their traits.
○ coadaptations only happen between plants.
○ coadaptations explain how organisms adapt, but it does not explain how new traits are formed in a population.

Explanation:

1. Analyze the first option: The scenario shows pine trees (prey - like, in terms of crossbills' predation) adapted with heavier cones, then crossbills (predator) adapted with deeper beaks. This fits the idea that one organism's adaptation (pine trees) pressures another (crossbills) to develop counter - adaptations.
2. Analyze the second option: The word "always" is incorrect. Coadaptation can occur in non - predator - prey relationships too, and the scenario also shows the prey (pine trees) adapting first, not just the predator forcing the prey.
3. Analyze the third option: The word "always" is incorrect. The scenario has a predator (crossbills) adapting to prey (pine trees) adaptation, not just prey forcing predator. Also, coadaptation is not limited to this direction.
4. Analyze the fourth option: The scenario involves a bird (crossbills) and a plant (pine trees), so coadaptation is not only between plants.
5. Analyze the fifth option: Coadaptation does explain how new traits form in a population (e.g., crossbills developed deeper beaks as a new trait due to coadaptation with pine trees). So this is incorrect.

Answer:

A. Adaptations made by one organism exert a pressure on a closely interconnected organism to develop counter adaptations or traits to survive.