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 three major groups of mammals are monotremes, which lay external eggs; marsupials, which carry their babies in a pouch; and placental mammals, which carry and gestate their fetuses internally. Humans fall into the category of placental mammals. Examples of monotremes and marsupials are the platypus and the kangaroo, respectively. Keep Learning.