Centromeres split apart during anaphase.
spindle fibers pull the to sister chromatids apart.
The main food sources of the birds( the plentiful recourses within the environment occupied by the species)
Amount of wear, and how long they are may contribute with age and maybe even coloration and pigment.
The correct answer is angioplasty.
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Angioplasty is one of the treatments after heart attack including special tubing with an attached deflated balloon. The tube is threaded up to the coronary arteries. Angioplasty is usually combined with the placement of a small tube called a stent which helps to restore the flow of blood through the artery and decreases its chance of narrowing again.</span>
