Name the stored food of animals.

Explain the process of nutrition in Amoeba.

Choose the correct path of urine in our body.

Two green plants are kept separately in oxygen-free containers,one in the dark and the other in continuous light. Which one will live longer? Give reasons.

The largest artery is the aorta and the largest vein is the vena cava.

Give reasons for the following:
$(a)$ Rings of cartilage are present in the trachea.
$(b)$ Mucus is secreted along with $HCl$ in the stomach.