What is used to sort dna into different lengths? apex?

Gel Electrophoresis.

Explanation: Gel Electrophoresis is a laboratory technique by which DNA fragments of different sizes can be sorted according to the molecular sizes.

The fragments of the different sizes of DNA move by the effect of the electrical field through a gel that contains small pores.

This gel contains a DNA ladder that has different base pairs indicated on it which is used to determine the size of the DNA fragments.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.