11. male american goldfinches grow yellow feathers during the mating season and will attack another goldfinch in its territory if it also has yellow feathers. what term describes the yellow feather stimulus in this example?

Its releaser best describes the yellow feather stimulus.  

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explanation:

the universal gravitation equation. since the gravitational force is directly proportional to the mass of both interacting objects, more massive objects will attract each other with a greater gravitational force. if the mass of one of the objects is doubled, then the force of gravity between them is doubled.