In testing a hypothesis thatʺterritorial defense in European robins is a fixed action pattern that isreleased by the sight of orange feathers,ʺresearchers found that robins defended their territory byattacking anything that was of similar size and had an orange patch. What experiment would youperform next to determine that the color initiated the defense response?A) Repeat the experiment by removing the patch completely. B) Repeat the experiment using a blue patch instead of an orange patch. C) Repeat the experiment by using a model of a robin that was twice the size of a normal robinbut with a small orange patch. D) Repeat the experiment by using a model of a robin that had an orange patch that was twicethe size of a normal patch.

The correct answer is option A) "Repeat the experiment by removing the patch completely".

Explanation:

In this example, researchers believe that European robins have a territorial defense pattern where they attack anything similar to orange feathers, including an orange patch. In order to establish if the color initiated defense response is real it is necessary to repeat the experiment by removing the patch completely. If the European robins do not longer attack, then the researchers can conclude that the color initiated defense response is real.

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.

on island x the species needed to adapt because they were being subject to predators which didn't inhabit island y.