What would be the consequences of a deficiency of haemoglobin in our bodies?

Which of the following statements is (are) true about the human heart?
$(i)$ The left atrium receives oxygenated blood from different parts of the body.
$(ii)$ The left ventricle pumps oxygenated blood to the entire body, while the right ventricle pumps deoxygenated blood to the lungs.
$(iii)$ The left atrium transfers oxygenated blood to the right ventricle.
$(iv)$ The right atrium receives deoxygenated blood from the body.

What will happen if platelets were absent in the blood?

In $Xylem$,minerals in solution form move in both directions (upward and downward).

State whether the following statement is true or false: 'Reptiles have a three-chambered heart,mammals have a four-chambered heart,and fishes have a two-chambered heart.'

In which of the following vertebrate group/groups,does the heart not pump oxygenated blood to different parts of the body?