In your project, you are attempting to tech about the evolution of Humans, whales, and dolphins. In this drawing, you have illustrated the brain and arm or fin of the three species. The basic structures of the arm that you are showing are the humerus, radius, ulna, carpal bones, metacarpals, and phalanges. It appears that all three of the species have evolved to have the same structures in their arms or fins. Albeit they are very different in size. The whale has focused more on length and width rather than strength like the human arm. This is probably because the whale needs a significantly larger arm to provide propulsion. The length is provided mostly by the phalanges. Based off the photo, they have 4 more than we do on each finger. The longer and wider the whale’s fin is, the less energy they have to expend when swimming. Unlike the whale and the dolphin, the human arm is used not for propulsion, but for manipulation. We have an opposable thumb that allows us to easily pick up things and hold them. There are also less phalanges in the human hand. This uniformed and comparatively short number of phalanges are partially what allows for the fine motor skills that we use every second of every day.
As for the part of your project that shows the human and dolphin brain, I cannot understand why there are more folds in the grey matter than in the human brain. With more folds, there is more surface area. More surface area, more neurons, more intelligence/ thinking power. However, dolphins are significantly less intelligent than most humans.
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In your project, you are attempting to tech about the evolution of Humans, whales, and dolphins. In this drawing, you have illustrated the brain and arm or fin of the three species. The basic structures of the arm that you are showing are the humerus, radius, ulna, carpal bones, metacarpals, and phalanges. It appears that all three of the species have evolved to have the same structures in their arms or fins. Albeit they are very different in size. The whale has focused more on length and width rather than strength like the human arm. This is probably because the whale needs a significantly larger arm to provide propulsion. The length is provided mostly by the phalanges. Based off the photo, they have 4 more than we do on each finger. The longer and wider the whale’s fin is, the less energy they have to expend when swimming. Unlike the whale and the dolphin, the human arm is used not for propulsion, but for manipulation. We have an opposable thumb that allows us to easily pick up things and hold them. There are also less phalanges in the human hand. This uniformed and comparatively short number of phalanges are partially what allows for the fine motor skills that we use every second of every day.
As for the part of your project that shows the human and dolphin brain, I cannot understand why there are more folds in the grey matter than in the human brain. With more folds, there is more surface area. More surface area, more neurons, more intelligence/ thinking power. However, dolphins are significantly less intelligent than most humans.