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.
Fossil evidence shows that the first placental mammals evolved during the early Paleogene Period (65.6 million to 23 million years ago), some 200,000 to 400,000 years after the extinction of the dinosaurs at the end of the Cretaceous Period (145.5 million to 65.5 million years ago).