What is the main toxic waste that the kidneys filter from the blood?

Select the correct statement.

Describe the process of urine formation in kidneys.

Liver is the largest organ as well as the largest gland of the body.

$(a)$ Name the following:
$(i)$ Organ which stores bile
$(ii)$ Organ which produces bile
$(b)$ Name one enzyme present in pancreatic juice and give its functions.
$(c)$ What are peristaltic movements?

Explain why transportation of materials is necessary in animals.