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What are the four main evolutionary lines of placental mammals?
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∙ 14y ago
Supraprimates, Laurasiatheira, Xenartha, and Afrotheria. Supraprimates evolved into primates, colugos, tree shrews, rodents, and lagomorphs (rabbits, hares, and pikas). Laurasiatheria evolved into pangolins, carnivores, odd-toed ungulates, cetaceans (whales, dolphins, and porpises), even-toed ungulates, bats, erinaceomorphs (hedgehogs, gymnures, and moonrats), and soricomorphs (shrews, moles, and solenodons). Xenartha evolved into armadillos, anteaters, and sloths. Afrotheria evolved into elephants, sea cows (manatees and the dugong), hyraxes, the aardvark, elephant shrews, tenrecs, and golden moles.
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∙ 14y ago
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How are polar bears and cows alike?
Both are four legged placental mammals. Other than that, they are not related at all.
Are hamsters amphibian?
No. They're mammals, like you & me. Guinea Pigs have spines, which makes them vertebrates, not invertebrates.
Which group has four extraembryonic membranes aquatic animals or land animals?
The answer to this is not based on where the animal lives but on the type of animal. Animals that lay eggs have fewer extraembryonic membranes than placental mammals...there are mammals in the ocean as well as on land.
Is the animal armadillo a mammal?
They're armoured mammals of the family Dasypodidae.
What organs do mammals have that other animals don't?
Mammary glands (in adult females), a neocortex (a region of the brain), a corpus callosum (another region of the brain, in placental mammals only), and the malleus and incus middle ear bones.
What animal group does the echidna belong to?
Echidnas belong to the group of mammals known as monotremes. They are mammals that lay eggs, as opposed to placental mammals, which give birth to live young. (Marsupials - pouched mammals - are also placental mammals.) Their order is "monotremata", and there are only five living monotreme species: the platypus and four species of echidna (also known as spiny anteaters). All of them are found only in Australia and New Guinea.
Which event is the most likely to cause for the four periods when punctuated equilibrium seems to have occurred?
Extinction events, such as the Permian extinction and the KT extinction event. You have adaptive radiation driving evolutionary change after such events. Google " the rise of the mammals. "
Can cat lays eggs?
Cats are mammals. The only mammals which lay eggs are the monotremes. The only surviving examples of monotremes are all indigenous to Australia and New Guinea, although there is evidence that they were once more widespread. Among living mammals they include the platypus and four species of echidnas (or spiny anteaters). There are no feline monotremes. Cats cannot lay eggs.
How are the Quokkas like humans?
Quokkas a mammals, like humans, so they share various mammalian traits. These include feeding their young on mothers' milk, having hair, breathing through lungs and having a four-chambered heart. However, quokkas are marsupials while humans are placental mammals, so when it comes to reproduction, they are very different.
Which event is the most likely cause for the four periods when punctuated equilibrium seems to occur?
Extinction events, such as the Permian extinction and the KT extinction event. You have adaptive radiation driving evolutionary change after such events. Google " the rise of the mammals. "
What of the four evolutionary mechanisms is responsible for adaptation?
Mutation, Reproduction.
What is a stanza called that has four lines?
A stanza of four lines is called a quatrain.
