Explain why transportation of materials is necessary in animals.

(N/A) Transportation of materials is essential in animals for the following reasons:
$1$. It ensures the distribution of vital substances like food,oxygen,and water to all cells of the body.
$2$. It facilitates the removal of metabolic waste products from the cells to the excretory organs,from where they are expelled from the body.
$3$. It helps in maintaining a uniform internal environment,including the regulation of body temperature and pressure.