Not every relation is a function. But every function is a relation. Function is just a part of relation.
The cubic function.
Range
A formula or graph are two ways to describe a math function. How a math function is described depends on the domain of the function or the complexity of the function.
The Mandelbrot graph is generated iteratively and so is a function of a function of a function ... and in that sense it is a composite function.
An allantois is a sac which develops in the alimentary canal of the embryos of mammals, birds and reptiles.
allantois
allantois
chorion
The inner cell mass (ICM) produces three embryonic membranes, the amnion, allantois, and the yolk sac.
allantois
for A+ students like me: The Allantois raynaray
allantois
It excretes it into the ALLANTOIS GLAND.
The allantois membrane and the chorion form the placenta in mammals. The chorion is the outermost fetal membrane that encases the embryo and later fuses with the maternal tissue to form the placenta.
Anatomical terminology. The allantois (plural allantoides or allantoises) is a hollow sac-like structure filled with clear fluid that forms part of a developing amniote's conceptus (which consists of all embryonic and extra-embryonic tissues). It helps the embryo exchange gases and handle liquid waste.
Allantois, amnion, and chorion