placental mammals

Placental mammals are a group of mammals characterized by their advanced reproductive system, where the developing fetus grows inside the mother's uterus and is nourished through a specialized organ called the placenta. This organ allows for efficient transfer of nutrients and waste between mother and fetus, supporting longer pregnancy periods and more developed offspring at birth. Examples include humans, dogs, whales, and elephants. This adaptation generally results in higher survival rates for their young, enabling placental mammals to thrive in diverse environments worldwide.