Humans had to invent tools, language, agriculture, and settlements to transition from the prehistoric period to the historical period. These developments allowed early humans to establish permanent societies, create civilizations, and record their histories.
you can develop breasts before you begin your period. however it is more common to develop them after.
humans
No
because of a common ancestor of all vertebrates in Pre-Cambrian period, scientists says that they all will have a common development stage.
Humans exist in the current era known as the Holocene epoch, which began around 11,700 years ago. We are currently in the Quaternary period of the Cenozoic era.
Humans have an average gestation period (time of pregnancy) of 280 days.
Womb like humans
Humans have an average gestation period (time of pregnancy) of 280 days.
Latent period is the length of time that it takes for a disease to develop
Horses are like most mammals (humans, too) and the unborn develop in a uterus.
It depends what the animal is.