Why might you want to use a single fixed pulley?

a to reduce the force needed to raise objects

b to raise or lower heavy objects

c

to raise or lower lightweight objects

d

to reduce the weight of lifted objects

A

Explanation:

A fixed pulley raises the load in a unidirectional manner... This therefore reduces the force required to raise that same load without the pulley.. It actually reduces the force required to raise objects

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 its the first one