Construction is the process of constructing a building or infrastructure. Construction differs from manufacturing in that manufacturing typically involves mass production of similar items without a designated purchaser, while construction typically takes place on location for a known client.
Eutherians, often called placental mammals, have a unique reproductive system in which unborn young are nourished for an extended period via a placenta. This system permits retention of the young in the protective environment of the uterus during most of early development.
The marsupials constitute the crown group of the Metatheria, and include all living metatherians as well as many extinct ones; the placentals are the crown group of the Eutheria. Except for the five species of monotremes (egg-laying mammals), all modern mammals give birth to live young.Most mammals, including the six most species-rich orders, belong to the placental group.he word  mammal  is modern, from the scientific name Mammalia coined by Carl Linnaeus in 1758, derived from the Latin mamma (teat, pap).