What is an important function of the urinary system?

Which property is used to identify the origin of an igneous rock? color density hardness crystal size

Natalie had random hand movements when she was two months old. when she was six months old, she used to grab a block with her whole hand. now at the age of ten months, she can grasp the same block with her thumb and forefinger. this sequence of growth in her hand and finger movements is according to the pattern.

Why is excretion necessary to maintain homeostasis?