Etymology and definitions. Being a warm-blooded mammal presents one of the biggest challenges for Balaenoptera musculus. Cetaceans are entirely carnivorous.

Cetacean, any member of an entirely aquatic group of mammals commonly known as whales, dolphins, and porpoises. Study of the rest of the skeleton also revealed that Indohyus had bones marked by a similar kind of thickening, an adaptation shared by mammals that spend a lot of time in the water. These animals are called "secondarily aquatic" because although their ancestors lived on land for hundreds of millions of years, they all originally descended from aquatic animals (see Evolution of tetrapods).

The more closely organisms are related, the more similar the homologous structures are. In fact, some of the animals have two blow holes next to each other and others have only one. Certain body characteristics are more common in particular environments. Blow holes are surrounded by muscles that keep the hole closed when the whale or dolphin is under water and open it when the animal is at the surface and needs to breathe. Explain how coral is an example of mutualism between two species. Blue Whale Photos by Oceanlight.com Blubber. Fish are cold-blooded, so their body temperature changes depending on the temperature of their environment. That's because we, and in fact all tetrapods (four-limbed vertebrates, many of which live on land), share a more recent common ancestor with the coelacanth and lungfish than we do with ray-finned fishes.
For example, the red-eyed frog has sticky pads attached to its feet that help it in climbing trees.
So when you see a picture of a whale, see if you can tell the difference.

Another example of adaptation in animals is the monkey. However, their living environments are sometimes similar, but amphibians could inhabit both aquatic and terrestrial environments. Differences between whales and fish. Their ancestors moved their limbs in a vertical plane, and thus cetaceans use vertical strokes when they swim, instead of horizontal strokes like a crocodile or fish. Heat loss in water is 27 times greater than the same temperature on land, thus blue whales must adapt to the cool ocean temperatures to avoid excessive heat loss and to maintain metabolic activity. The first thing to notice on this evogram is that hippos are the closest living relatives of whales, but they are not the ancestors of whales. c. hippos are whales' closest living relatives. For example fish can live tens of thousands of feet below the water. The baleen plates, which look like giant combs, hang from the roof of the whale's mouth.

Reef fishes tend to be brightly-colored while those that live in murky water tend to be mud-colored.


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