Which part of the alimentary canal receives bile from the liver?

$(a)$ Draw a sectional view of the human heart and label the following parts on it:
Pulmonary artery,right atrium,left ventricle,septum.
$(b)$ What do the following transport?
$(i)$ Xylem
$(ii)$ Phloem
$(iii)$ Pulmonary vein
$(iv)$ Vena cava

Is 'nutrition' a necessity for an organism? Discuss.

$(a)$ Name the extensively coiled structure of the alimentary canal.
$(b)$ Compare the length of the small intestine in herbivores and carnivores.

State in brief the function of:
$(a)$ Renal artery
$(b)$ Kidney
$(c)$ Ureter
$(d)$ Urinary bladder

Why is it advised to use iodised salt in our diet?