Which is a strong synthetic polymer that can be used to make toys and bottles? polystyrene foam polyethylene nylon vulcanized rubber

i think its the second one im doing the test right now hopes this helps have a good rest of your day

Explanation:

B=polyethylene should be the right answer

Explanation:

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.

i think the answer is a.keratin is the pigment responsible for skin color.