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Do marsupials and placental mammals both develop their young at least partly within their bodies in a uterus?
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Is a placental mammal a mammal that lays eggs outside their bodies?
No. Mammals which lay eggs outside their bodies are monotremes.A placental mammal gives birth to live young which are fully developed, unlike marsupials, which give birth to live young which are very undeveloped.
Why do offspring develop inside their mother?
Placental mammals.
What are the main groups of mammals and how do they differ?
There are three main groups of mammals-monotremes, marsupials, and placental mammals. The groups differ in how their young develop.Egg-laying mammals are called monotremes. There are just three species of monotremes-two species of spiny anteaters and the duck-billed platypus. A female spiny anteater lays one to three leathery-shelled eggs directly into a pouch on her belly. After the young hatch, they stay in the pouch for six to eight weeks. There they drink milk that seeps out of pores on the mother's skin. In contrast, the duck-billed platypus lays her eggs in an underground nest. The tiny young feed by lapping at the milk that oozes from slits onto the fur of their mother's belly.Koalas, kangaroos, and opossums are some of the better-known marsupials.Marsupialsare mammals whose young are born at an early stage of development, and they usually continue to develop in a pouch on their mother's body. Marsupials have a very short gestation period, the length of time between fertilization and birth. For example, opossums have a gestation period of about 13 days. Newborn marsupials are tiny-some opossums are less than 1 centimeter long at birth! When they are born, marsupials are blind, hairless, and pink. They crawl along the wet fur of their mother's belly until they reach her pouch. Once inside, they find one of her nipples and attach to it. They remain in the pouch until they have grown enough to peer out of the pouch opening.Unlike a monotreme or a marsupial, a placental mammal develops inside its mother's body until its body systems can function independently. The name of this group comes from the placenta, an organ in pregnant female mammals that passes materials between the mother and the developing embryo. Food and oxygen pass from the mother to her young. Wastes pass from the young to the mother, who eliminates them. An umbilical cord connects the young to the mother's placenta. Most mammals, including humans, are placental mammals. Gestation periods of placental mammals are generally longer than those of marsupials. Usually, the larger the placental mammal, the longer the gestation period. The gestation period for an elephant, for example, averages about 21 months, but for a mouse, it's only about 20 days.Placental mammals are classified into groups on the basis of characteristics such as how they eat and how their bodies move.
What is a koalas relationship with a human?
Koalas (Phascolarctos cinereus) are marsupials which belong to the class Mammalia. Mammals have certain characteristics that make them alike: 1. They have a coat of fur or hair somewhere on their bodies 2. They are endothermic 3. Mammals feed their young milk Koalas are marsupials, humans are placentals. But they still belong to the same class- Mammalia
Why don't whales lay eggs?
Whales are ovoviviparous because they are mammals, because of this their eggs develop inside of their bodies and they give birth to live young.
Is a hippo a marsupial placental or monotreme?
The Hippopotamus is a placental mammal, in that its young gestate inside of the female, are are born after they have developed enough to survive outside of their mother. Marsupials females have a pouch within which they carry their young through early infancy. Monotreme females do not gestate their young within their bodies, but instead lay eggs like birds or reptiles.
How do mammals reproduce and develop?
All mammals reproduce sexually and mothers give birth to their young, except for platypuses and echidnas which lay leathery eggs but are still mammals in every other sense. Placental mammals develop inside of their mother's womb and begin as an embryo. They gain nutrients through their umbilical cord and over time, they grow. Once born, their bodies are developed enough for the baby to live independently of the mother, although they are still dependent on the mother for milk and nurturing. In the case of marsupials, they have a very short gestation period, and spend many more months developing within the mother's pouch. They are born extremely undeveloped, and once born, they cannot live independently of the mother. They must attach to a teat in the pouch (or the mother's underbelly in the case of the numbat, which does not have a pouch) and remain permanently attached to this teat for several weeks or months, depending on the species of marsupial. If removed prematurely, they cannot live.
Do mammals have hair on their bodies?
not all of them
What can mammals do that non-mammals cannot?
mammals can give birth to live young they have hair on their bodies and they can produce milk.
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Why is a monotreme different from placental mammals and marsupial mammals?
Eutherians, or placental mammals nurse their young in a womb. Protherians like platypus lay eggs and do not have teats but ooze milk through the skin. Marsupials only nurse the young in the body for a very short time before they are born. The progeny live in a pouch suckling for months after birth until old enough to emerge.
What burrowing mammals are similar to a badger?
Badgers are similar to mammals such as weasels and skunks. They are all burrowing mammals that have flat, elongated bodies.
