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Why are the water based whales and dolphins classified under the mammals group?
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What is the realtion between a dolphin and a shark?
In actuality, dolphins and sharks aren't related at all. A shark is a fish, while a dolphin is a mammal. They look similar because of a phenomenon called convergence. Convergence is when two unrelated organisms evolve similar mechanisms to cope with the same environmental structure. This means that sharks and dolphins look the same because that form is the best form for an aquatic predator. For another example, look at the extinct ichthyosaurs. They may look like dolphins and fish, but they are actually repitles that evolved from a land-based ancestor. their fin bones
Why do scientist think whales evolved for acient mamals not fish?
Because they believe that mammals evolved from land-based creatures. When scientists studied the whales they noticed that whales share a lot of bodily functions with land living mammals despite their fishy apperance. The most obvious one is that they need to breath air, fish on the other side can breath water. Whales are warmblooded, fish are coldblooded. Whales get pregnant and have a womb where the fetus grow until it is born, fish on the other hand lay eggs which develop outside the mothers body. A whales skeleton also has several details in common with land based mammals (see http://en.wikipedia.org/wiki/Evolution_of_Cetaceans). In more recent years, scientists have compared the DNA of whales with land based mammals and found that they have a lot in common, and thus must be closely related.
Send some activities and games based on Ocean day theme for pre-school?
the kids wont be able to read so only colouring in whales, dolphins or penguins.
Do dolphins have hip bones?
Yes! They are vestigial (not serving a purpose biologically), and are remnant from a time when early early ancestors of whales were land based animals.
How are organisms sorted?
Organisms are classified based on a number of different criteria. Animals that have hair, are warm-blooded, and give birth to live young are mammals. Those animals that are cold-blooded and lay eggs are amphibians or reptiles. Animals are also classified based on whether or not they have a backbone (vertebrates) or not. (invertebrates.)
Which animals are mammals?
warm blooded ones. Like a monkey.There are three types of mammals based on their mode of reproduction.Monotreme mammals lay eggs, for example the platypus.Marsupial mammals have young that develop in the uterus for a short term, for example the kangaroo.Placental mammals develop through advanced stages in the uterus and receive maternal nutrients across the placenta, for example cats.
What were the first marine mammals to evolve?
Marine mammals such as whales, dolphins and porpoises, are collectively labelled cetaceans (of the order Cetacea, comprising 87 modern species). Cetaceans appear to have evolved from a land mammal that began adapting to marine environments 50,000,000 years ago; the earliest known 'proto whale' (ancestor of modern Cetaceans) is named Pakicetus- a land-based quadruped that eventually evolved into Ambulocetus, which lived in shallow waters but were still able to walk on land.
What did Linnaeus classified organisms based on similarities on their?
Linnaeus classified organisms based on their morphological similarity.
Do dolphins have all cartilage instead of bone?
No, dolphins have a bone-based skeletal system.
Is a whale classified as a fish or mammal?
Plankton are an aquatic organism. There are three classifications of plankton and it is based upon their phylogeny. There are the phytoplankton which are photosynthetic organisms and microscopic algae; there are zooplankton which are invertebrate animals; and there are ichthyoplankton which consist of the larval fish components.
How are engineering materials classified?
the material usually classified based on their properties.
How are geodes classified?
The igneous geodes are classified as intrusive and the sedimentary geodes are classified as chemical based on properties.
