0
What else can I help you with?
Which is the difference between the three mammal groups?
The three main groups of mammals are monotremes, marsupials, and placental mammals. Monotremes, like the platypus, lay eggs and produce milk but lack nipples. Marsupials, such as kangaroos, give birth to underdeveloped young that continue to develop in a pouch. In contrast, placental mammals, including humans, have a complex placenta that nourishes the developing fetus during a longer gestation period inside the womb.
Why are some mammals that lay eggs classified as mammals?
Monotremes lay eggs, as do reptiles. Monotremes' limbs go outward (rather than downward) from their main body, which is also true for reptiles. Monotremes lack a corpus callosum (which placental mammals have), as do reptiles. Monotremes and reptiles both have cloacas, while placental mammals have separate openings for urination and defecation. This evidence all shows monotremes to be a link between reptiles and mammals, but we now think that monotremes just evolved from an earlier branching from the mammalian tree of lineage than the marsupials and placental mammals evolved from. Monotremes are not a link between reptiles and mammals.
Do monotrems have mammary glands?
Yes. Monotremes are mammals, so they have mammary glands. What they lack, however, is developed teats for the young babies to suckle. These animals do not suckle their young quite like other mammals do. They do not have nipples, but exude milk from specialised sweat glands on their abdomen.
What organ systems do Echinoderms lack?
What organ systems do echinodermes lacking
Why are monotremes found in austrillia?
Monotremes were among the earliest mammals to evolve. However, in most of the world, all monotremes went extinct as a result of competition with more advanced placental mammals. Australia and New Guinea, however, have been so isolated that there were nearly no placental mammals (except for bats) until humans introduced them. The lack of competition from placental mammals allowed monotremes to survive in Australia.
Lack of development of an organ or tissue?
aplasia
Which organ does a deer lack?
Deer do not have a gallbladder. Scientists have still not been able to establish why they lack this organ that's responsible for producing bile that aids in digestion.
Can transmen get pregnant?
No, they cannot, they lack the required organs to become pregnant.
What is the difference between aplasia and agenesis?
Aplasia is the absence of the organ with only the rudiment present Agenesis is the complete lack of the organ
Which organelle seperates eukaryote from prokaryote?
It is the nucleus .Prokariyotes lack a nucleus.
What reproductive organs are present in monotremes?
Monotremes, such as the platypus and echidna, possess unique reproductive organs that include cloaca, which serves as a common opening for excretion and reproduction. Female monotremes have specialized mammary glands that produce milk, though they lack nipples; milk is secreted through openings in the skin and pools in grooves for the young to lap up. Males have testes that remain internal and do not descend into a scrotum, which is unlike most other mammals. Additionally, male monotremes have spurs on their hind limbs that can deliver venom.
Which marsupials lack a forked penis?
Big Red Kangaroo, Western Grey Kangaroo, Eastern Grey Kangaroo, Whiptail Wallaby, Honey Possum
