In mammals urine is expelled through the urethra which is part of the excretory system in unicellular organisms waste products are discharged directly through the surface of the cell
Answer:
A.) It has two cell layers.
Answer:
c
Explanation:
mercury is smallest jupiter is biggest
As the fetus develops inside a woman's uterus, another vital structure is in place to provide a vital service to mother and child: the placenta. It is a spongy structure, filled with blood vessels that come from the mother by way of the lining of the uterus, and then connects with the baby by the umbilical cord