what is the major difference between whales and the fossils of whales' ancestors?
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Unlike the hippo's ancestor, whale ancestors moved to the sea and evolved into swimming creatures over a period of about 8 million years. Fossils of gigantic ancient whales called Basilosaurus were first mistaken for dinasaur fossils but were later recognised as mammals.
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Technically, the most obvious disparity between bony vs cartilaginous fish comes from the fact that the skeleton of bony fish is made of bones alone, while that of cartilaginous fish is made of cartilage. There are more than 20,000 fish species in the world.
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That distinction goes to the blue whale (Balaenoptera musculus), the largest animal on Earth. ... The sperm whale (Physeter macrocephalus), on the other hand, may not be the biggest whale, but it has the biggest brain to have ever existed on Earth .
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Snails' ancestors are one of the earliest known types of animals in the world. ... There are many types of snails, but they fundamentally differ because they are aquatic or terrestrial. The former are adapted to live in the sea or bodies of fresh water, but the latter live exclusively on land, although in humid areas.
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Are whales fish? Whales, along with dolphins and porpoises, are warm-blooded mammals and breathe air like humans do.
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whale: Characteristics and Behavior. Enter your search terms: Like other mammals, whales breathe air, are warm-blooded, and produce milk to feed their young. Their adaptations for aquatic life include a streamlined form, nearly hairless skin, and an insulating layer of blubber, which can be as thick as 28 in.
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Vertebrate. Animals can be classified into two main groups: vertebrates and invertebrates. The main difference between vertebrates and invertebrates is that invertebrates, like insects and flatworms, do not have a backbone or a spinal column.
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Palaeontologists, people who study fossils, divide them into two major types - body fossils and trace fossils. Body fossils show us what a plant or animal looked like. The first type, body fossils, are the fossilised remains of an animal or plant, like bones, shells and leaves.
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Describe the Types of Fossils According to "Enchanted Learning," archaeologists use three main types of fossil: the true form fossil, trace fossil and mold fossil; a fourth type is the cast fossil. Fossilization can take millions of years to occur.
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The short answer is: Yes, dolphins are a type of whale. If this answer doesn't satisfy you, continue reading. Whales, or cetaceans, as the scientists call them, are a group of mammals which are distributed throughout the world's oceans and even in some freshwater areas.
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Snails' ancestors are one of the earliest known types of animals in the world. ... All land snails are gastropod mollusks, meaning that they belong to the same group of octopuses, which are part of the phylum Mollusca. At the same time, they are members of the class Gastropoda, which includes all snails and slugs.
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The short answer is: Yes, dolphins are a type of whale. ... Whales can be divided into two groups, these are called baleen whales (Mysticeti) and toothed whales (Odontoceti). Most whales belong to the group of toothed whales such as all dolphins and porpoises.
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Fish fins and whale flippers are both homologues to an extent but more analogous as the actual structure of a fin is much different than the flipper of a whale. Embryology tells us that that organisms that evolved from a common ancestor develop in similar away to the original ancestor.
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Essentially, a fossil is a record of an organism, showing and the size, shape and texture of different body parts. Common examples of fossils include teeth, skin, nests, dung and tracks. However, not all fossils are formed in the same way. ... These are mold fossils, cast fossils, trace fossils and true form fossils.
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They may be described as the 'wolves of the sea', but it turns out that the killer whale is more closely related to the cow than the predatory canine. ... The research shows that killer whales and cows share a common ancestor while walruses share one with dogs and manatees evolved from the ancestors of elephants.
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The reason cannot be found in kinship, as bats and whales are no closer related to each other than all other mammals descended from the same land vertebrates for 200 million years ago. The answer lies in convergent evolution -- when almost identical features or developments happen in different species.
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Whales are perfect examples of aquatic animals which are not fishes. They actually belong to class Mammalia and fishes belong to class pisces.