An important part of topsoil is
loam
permafrost
growing plant roots
decayed organic matter

decayed organic matter

Explanation:

Decaying organic matter is an important part of topsoil found worldwide.

Incorrect answers (with explanation):

Loam is a type of soil, not a part of topsoil.

Permafrost is only found in arctic regions, and is frozen ground, not a part of the soil.

Plant roots grow into topsoil, but are not a part of the soil itself.

I hope this helps!

answer; i believe the correct answer is (anemia);

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.