Dolphins Vs Sharks

JH
by Jacqueline Holmes1 view·Updated Mar 4, 2021
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  1. Hello. My name is Jacqueline Homes, and I'm going to
  2. be talking about the structure and functions of dolphins and
  3. sharks and their similarities and differences.
  4. For starters, we're going to be talking about the analogous
  5. structure of the skeleton of each of these animals.
  6. Analogous means that they do not come from a common
  7. ancestor due to these structural differences, which make them unique
  8. to themselves.
  9. So for starters, we're going to talk about the bones.
  10. However, inside a shark they do not have bones.
  11. They have cartilage, which is more flexible.
  12. And it's lighter than a bone, which makes it easier
  13. for them to swim in the oceans and to gain
  14. more speed without the bones weighing them down.
  15. So as we have said that, the dolphins do have
  16. bones, and with that, there has been research that there
  17. were little almost hind looking legs in the back of
  18. their body, which made it seem like they could have
  19. been amphibious and come from a common ancestor of an
  20. amphibian rather than you know, a fish or a mammal.
  21. So that's something that's different compared to the shark that
  22. is a fish with cartilage, not bones.
  23. Yeah, so next, we are going to talk about the
  24. homologous structure.
  25. The homologous structure is structures that are similar, similar in
  26. function and could relate back to a common ancestor, unlike
  27. the analogous structures.
  28. So for the homologous, there is a dorsal fin.
  29. Although the fins are different, they are still a dorsal
  30. fin on the top of their body, where it is
  31. exposed outside of the ocean.
  32. When you can see the little thin over the ocean
  33. water, they also live in oceans and swim, which is
  34. nothing really new.
  35. They also have teeth in both of them.
  36. Whether they are the same looking teeth where they're flat
  37. edged or sharp, they both have teeth, which make it
  38. so that they're able to eat certain foods.
  39. One common food that they can eat is actually fish
  40. because dolphins are carnivores as well.
  41. So they eat fish, squid.
  42. All this stuff they also and both animals have really
  43. good vision.
  44. So it is said that the dolphin can see in
  45. both the ocean water and above the water as well.
  46. The quality above the water isn't as good as below.
  47. The water over there is still able to see below
  48. the water and have good vision, just like the sharks,
  49. who have really good vision underneath the water as well.
  50. In both of the animals, they are able to swim
  51. at higher speeds due to their skin.
  52. Now in the dolphin, the dolphin has blubber it.
  53. Also, when it goes by water and the water flows
  54. past the skin, it creates a turbulence, which makes them
  55. swim a little faster compared to two no water flowing
  56. in them slowing down.
  57. The shark also has a unique skin where it's almost
  58. like the scales are almost teeth like.
  59. They have said inside the articles that I've read, which
  60. it reduces friction from the water into their skin, and
  61. it increases their speed as well, which is very interesting
  62. because I've never known anything like that.
  63. So next major difference, although we have said multiple differences,
  64. is that one is a fish and one is a
  65. mammal. The shark, as I said before, is a fish,
  66. and the dolphin is a mammal.
  67. The dolphin actually has little hairs on its body, which
  68. make it so that it's classified as a mammal, plus
  69. more more research with in the articles that sit with
  70. the hind legs, which can actually make a lot more
  71. sense that they would be considered a mammal considering of
  72. the common ancestor of mammals having legs also within the
  73. animals. The dolphin has a blowhole, so it is able
  74. to breathe in air and blow out water compared to
  75. the shark that has gills that make it breathe in
  76. the water.
  77. And that is how they actually survive.
  78. And it makes it so that, you know, they're able
  79. to breathe underwater, classified as a fish for breathing underwater
  80. and then the mammal for breathing in air and having
  81. the blowhole.
  82. So that is all for today.
  83. Here is just the sources that I used for my
  84. images. And then after the image sources, there is going
  85. to be the sources that I used originally.
  86. This is just one of the sources that are used,
  87. and the other two are located right there.
  88. Thank you for listening.