Best posts about this topicLoading . . .
Birth, also known as parturition, is the act or process of bearing or bringing forth offspring. In human and mammals etc, the process is initiated by hormones which cause the muscular walls of the uterus to contract, expelling the fetus at a developmental stage when it is ready to feed and breathe. In some species the offspring is precocial and can move around almost immediately after birth but in others it is altricial and completely dependent on parenting. In marsupials, the fetus is born at a very immature stage after a short gestational period and develops further in its mother's wombs pouch.
No signin required
Sussle is the first, open visual encyclopedia. Anyone can use it.
It has beautiful images and viral videos that are way more fun than reading all the text in traditional encyclopedias.
Just click on the red module above.